{"id":49840,"date":"2025-04-09T09:59:29","date_gmt":"2025-04-09T09:59:29","guid":{"rendered":"https:\/\/aboutsignal.com\/?p=49840"},"modified":"2025-12-10T11:35:10","modified_gmt":"2025-12-10T10:35:10","slug":"signal-ohne-telefonnummer","status":"publish","type":"post","link":"https:\/\/aboutsignal.com\/de\/blog\/why-a-phone-number-is-necessary-to-register-at-signal\/","title":{"rendered":"Warum zur Registrierung bei Signal eine Telefonnummer erforderlich ist"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Das Problem mit der Telefonnummer. Es ist wahrscheinlich einer der h\u00e4ufigsten Kritikpunkte, die man \u00fcber Signal h\u00f6rt. Und das will etwas hei\u00dfen. Ansonsten, mit seinem Fokus auf Sicherheit und Datenschutz bei gleichzeitiger Wahrung der Benutzerfreundlichkeit, bietet Signal wenig Anlass zur Kritik (<a href=\"https:\/\/aboutsignal.com\/de\/blog\/signal-messenger-kritik-welche-gibt-es-und-wie-reagiert-signal\/\">Wir haben h\u00e4ufige Kritikpunkte und Mythen \u00fcber Signal in einem separaten Blog-Beitrag \u00fcberpr\u00fcft<\/a>). Aber warum braucht man eine Telefonnummer, um sich bei Signal anzumelden? Hier kl\u00e4ren wir diese Frage und zeigen, dass es daf\u00fcr gute Gr\u00fcnde gibt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Wie funktioniert die Registrierung bei Signal?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zun\u00e4chst die Fakten. F\u00fcr die Registrierung bei Signal ben\u00f6tigt man eine Telefonnummer. Dies kann entweder eine Mobil- oder Festnetznummer sein. Diese Nummer wird dann bei der Registrierung mit einem Verifizierungscode best\u00e4tigt und mit deinem Signal-Konto verkn\u00fcpft. Details zur Registrierung bei Signal findest du <a href=\"https:\/\/support.signal.org\/hc\/de\/articles\/360007318691-Registriere-eine-Telefonnummer\">auf dieser offiziellen Support-Seite<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aber was ist der Grund f\u00fcr die Entscheidung, bei der Registrierung eine Telefonnummer anzufordern? Warum kann man sich nicht einfach mithilfe einer E-Mail-Adresse oder eines beliebigen Benutzernamens  bei Signal registrieren?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dies ist die Antwort, die Signal-Pr\u00e4sidentin Meredith Whittaker 2022 auf genau diese Frage gegeben hat:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Telefonnummern erm\u00f6glichen es Menschen, ihr soziales Netzwerk in Signal zu \u201eimportieren\u201c \u2013 und, was noch wichtiger ist, es mitzunehmen, wenn sie Signal nicht mehr verwenden m\u00f6chten. Das Netzwerk, das Menschen \u00fcber ihre Telefonnummern mitbringen, hilft dabei, sich schnell mit Freunden und Kollegen zu verbinden. Und nat\u00fcrlich steht genau dieses Netzwerk \u2013 das Netzwerk der Menschen, die dir wichtig sind, mit denen du zusammenarbeiten und kommunizieren m\u00f6chtest \u2013 im Zentrum eines funktionierenden Messaging-Dienstes.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Signal ohne Rufnummer? \u2013 Ausgestorben und erfolglos<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Wie s\u00e4he eine Welt aus, in der Signal keine Telefonnummer zur Registrierung ben\u00f6tigt? Nach der Installation von Signal w\u00fcsstest du schlicht nicht, welche deiner Freunde \u00fcber Signal erreichbar sind. Nat\u00fcrlich kannst du alle Freunde anrufen und fragen, ob sie Signal nutzen und wie ihr Benutzername lautet. Aber das ist f\u00fcr einen Messenger nicht wirklich praktikabel. Und Signal ist \u00fcberzeugt, dass nur ein praktischer Messenger auch ein n\u00fctzlicher und sicherer Messenger ist. Denn was n\u00fctzt ein (theoretisch) sicherer Messenger, den niemand nutzt? Genau. Deshalb hat sich Signal f\u00fcr einen Kompromiss entschieden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Durch die Registrierung mit der eigenen Telefonnummer kann es sofort losgehen. Jeder, der Signal installiert, sieht, welche der bestehenden Kontakte bereits bei Signal sind und kann sofort mit dem Schreiben sicherer Nachrichten beginnen. Das erkl\u00e4rt den gro\u00dfen Erfolg von Signal. Denn im Gegensatz zu vielen anderen verschl\u00fcsselten Messaging-Apps kann ich sofort loslegen und meine Freunde werden benachrichtigt, dass ich nun auch bei Signal bin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Au\u00dferdem \u2013 wie Meredith Whittaker im Zitat erw\u00e4hnt \u2013 erm\u00f6glicht Ihnen dies, so weit wie m\u00f6glich die Kontrolle \u00fcber dein soziales Netzwerk zu behalten. Angenommen, Facebook wird morgen geschlossen (man kann ja noch tr\u00e4umen), verlierst du dort sofort alle deine Kontakte. Andererseits ist ein soziales Netzwerk, das auf Telefonnummern basiert, unabh\u00e4ngig vom Netzbetreiber. Sollte Signal also morgen seine Dienste einstellen, kann ich zumindest meine per Telefonnummer gekn\u00fcpften Kontakte weiter pflegen und verliere sie nicht komplett.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hilft auch bei der Bek\u00e4mpfung von Spam<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.sueddeutsche.de\/wirtschaft\/signal-meredith-whittaker-whatsapp-messenger-datenschutz-1.5652005?reduced=true\">Wie Signal-Pr\u00e4sidentin Meredith Whittaker best\u00e4tigt<\/a> gibt es noch einen weiteren Grund, warum Signal f\u00fcr die Registrierung eine Telefonnummer verlangt: die Bek\u00e4mpfung von Spam.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nat\u00fcrlich ist es in manchen L\u00e4ndern relativ einfach, neue Telefonnummern zu erhalten und diese f\u00fcr Spam-Zwecke zu missbrauchen. Dies ist jedoch nicht so einfach und kosteng\u00fcnstig wie beispielsweise E-Mail-Adressen. Daher erleichtert die Telefonnummernpflicht auch Signal zur Bek\u00e4mpfung von Spam und damit zur weiteren SignalBenutzerfreundlichkeit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signal verbirgt standardm\u00e4\u00dfig die Telefonnummer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Obwohl du f\u00fcr die Registrierung zun\u00e4chst eine Telefonnummer ben\u00f6tigst, bedeutet das nicht, dass diese Telefonnummer auch f\u00fcr alle anderen Signal-Kontakte sichtbar ist. Seit Februar 2024 verbirgt Signal deine Telefonnummer standardm\u00e4\u00dfig vor deinen Signal-Kontakten. Wenn du Signal nutzt, ist deine Telefonnummer nicht mehr f\u00fcr alle sichtbar, mit denen du chattest (du kannst diese Einstellung in den Signal-Einstellungen \u00e4ndern). Es gibt nur eine Ausnahme: Personen, die deine Nummer in den Kontakten ihres Telefons gespeichert haben, sehen deine Telefonnummer weiterhin, da sie sie bereits kennen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Am Ende f\u00fchrt die Tatsache, dass man sich mit einer Telefonnummer registrieren muss, nur zu einer kleinen Information: Signal wei\u00df lediglich, dass diese Telefonnummer bei Signal registriert ist. Da jedoch alles Ende-zu-Ende-verschl\u00fcsselt ist, wei\u00df Signal sonst nichts. Deine Nachrichten, Medien, dein Profil, deine Gruppenmitgliedschaften, mit wem du sprichst \u2013 all diese Informationen sind verschl\u00fcsselt und vor Signal verborgen. Das gilt sogar f\u00fcr deine Kontaktliste.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signal kennt deine Kontakte nicht<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Es scheint logisch: Um festzustellen, welche meiner Kontakte bereits auf Signal, Signal muss mein Adressbuch kennen, oder? Wenn das wahr w\u00e4re, w\u00e4re das ein ernstes Datenschutzproblem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gl\u00fccklicherweise ist das bei Signal nicht der Fall. Wie Signal <a href=\"https:\/\/support.signal.org\/hc\/en-us\/articles\/360007061452-Does-Signal-send-my-number-to-my-contacts\">auf seinen Support-Seiten erkl\u00e4rt<\/a>:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Signal hat einen <a href=\"https:\/\/signal.org\/blog\/private-contact-discovery\/\">vertraulichen Kontakterkennungsprozess entwickelt,<\/a> mit dem Signal-Kunden und -Kundinnen auf effiziente und verl\u00e4ssliche Weise feststellen k\u00f6nnen, ob es sich bei den Kontakten in ihrem Adressbuch um Signal-User handelt, ohne die Kontakte in ihrem Adressbuch f\u00fcr den Signal-Dienst offenzulegen. Sobald dein Mobiltelefon wei\u00df, welche deiner Kontakte Signal nutzen, kann es dich optional benachrichtigen, wenn ein neuer Kontakt Signal nutzt.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Signal hat erhebliche technische Anstrengungen unternommen, um dieses Problem zu l\u00f6sen und gleichzeitig benutzerfreundlich zu sein und deine Daten zu sch\u00fctzen. Signal-Gr\u00fcnder Moxie Marlinspike hat die technischen Details und allgemeinen \u00dcberlegungen in zwei ausf\u00fchrlichen Blogbeitr\u00e4gen erl\u00e4utert. Wenn du an weiteren Details interessiert bist, findest du diese <a href=\"https:\/\/signal.org\/blog\/private-contact-discovery\/\">hier<\/a> und <a href=\"https:\/\/signal.org\/blog\/contact-discovery\/\">hier<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zusammenfassung<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Diese Erkenntnisse lassen sich wie folgt zusammenfassen: Die Tatsache, dass f\u00fcr die Registrierung bei Signal bringt gro\u00dfe Vorteile und sehr wenige Nachteile. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vorteile<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Du profitierst davon, dass du sofort mit deinen vorhandenen Telefonkontakten chatten kannst, ohne sie m\u00fchsam manuell nachschlagen zu m\u00fcssen. <\/li>\n\n\n\n<li>Deine sozialen Kontakte geh\u00f6ren dir und du bist nicht von einem kommerziellen Dienst abh\u00e4ngig, bei dem die Gefahr besteht, dass du alle deine Kontakte verlieren, wenn der Dienst eingestellt wird.<\/li>\n\n\n\n<li>Es ist schwieriger, Profile zu f\u00e4lschen und es ist einfacher f\u00fcr dich zu best\u00e4tigen, dass du tats\u00e4chlich mit den Leuten sprechen, mit denen du zu sprechen glaubst.<\/li>\n\n\n\n<li>F\u00fcr Spammer ist die Registrierung schwieriger und kostspieliger.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Nachteil<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Signal wei\u00df, dass diese Telefonnummer bei Signal registriert ist (und das Datum der Registrierung und der letzten Verbindung mit dem Dienst). Aber das ist auch schon alles. Signal kennt weder deinen Namen noch deine Nachrichten, deine Anrufe, dein Profil, deine Metadaten, deine Gruppen \u2013 nicht einmal deine Kontakte. <\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Am Ende muss also jeder selbst entscheiden, was davon wichtiger ist. Wie dieser Artikel gezeigt hat, gibt es durchaus viele gute Gr\u00fcnde, bei der Registrierung eine Telefonnummer zu verlangen \u2013 und das ist sicherlich einer der Gr\u00fcnde, warum Signal der beliebteste sichere und private Messenger weltweit ist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Signal hat gute Gr\u00fcnde f\u00fcr die Telefonnummernpflicht.<\/p>","protected":false},"author":2,"featured_media":52175,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"<!-- wp:paragraph -->\n<p>The issue with the phone number. It's probably one of the most common criticisms you hear about Signal. And that's saying something. Otherwise, with its focus on security and privacy while maintaining user-friendliness, Signal offers little cause for criticism (<a href=\"https:\/\/aboutsignal.com\/blog\/criticism-signal-messenger-and-how-signal-responds\/\">we have fact-checked common criticisms and myths about Signal in a separate blog post<\/a>). But why do you need a phone number to register at Signal? Here we'll clarify this question and show that there are good reasons for this.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:heading -->\n<h2 class=\"wp-block-heading\">How does the registration process at Signal work?<\/h2>\n<!-- \/wp:heading -->\n\n<!-- wp:paragraph -->\n<p>First, the facts. To register with Signal you need a phone number. This can be either a mobile or landline number. This number is then confirmed during registration with a verification code and linked to your Signal account. You can find details about registering with Signal on this <a href=\"https:\/\/support.signal.org\/hc\/en-us\/articles\/360007318691-Register-a-phone-number\">official support page<\/a>.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>But what is the reason for the decision to require a phone number during registration? Why can't you simply sign up at Signal using an email address or any username?<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>This is the answer that Signal's president Meredith Whittaker gave to exactly this question in 2022:<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:quote -->\n<blockquote class=\"wp-block-quote\"><!-- wp:paragraph -->\n<p>Phone numbers allow people to 'import' their social graph into Signal and, more importantly, take it with them if they decide to stop using Signal. The network people bring with them via phone numbers helps people quickly connect with their friends and colleagues. And, of course, that network\u2014the network of people you care about, want to collaborate with, and want to talk to\u2014is at the heart of a functioning messaging service.<\/p>\n<!-- \/wp:paragraph --><\/blockquote>\n<!-- \/wp:quote -->\n\n<!-- wp:heading -->\n<h2 class=\"wp-block-heading\">Signal without a phone number? \u2013 Empty and unsuccessful<\/h2>\n<!-- \/wp:heading -->\n\n<!-- wp:paragraph -->\n<p>What would a world look like where Signal wouldn't require a phone number for registration? After installing Signal, you simply wouldn't know which of your friends can be contacted via Signal. Of course you could call all of your friends and ask if they're on Signal and what their username is. But that's not really practical for a messenger. And Signal believes that only a practical messenger is a useful and secure messenger. After all, what's the value of a  (theoretically) secure messenger that no one uses? Exactly. That's why Signal has opted for a compromise.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>By registering with your phone number, you can get started right away. Everyone who installs Signal can see which of the existing contacts are already on Signal and can immediately start writing secure messages. This explains the great success of Signal. Because unlike many other encrypted messaging apps I can get started right away and my friends are notified that I'm now on Signal as well.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Additionally \u2013 as Meredith Whittaker mentions in the quote \u2013 this allows you to remain in \"ownership\" of your social network as much as possible. Assuming Facebook shuts down tomorrow (one can still dream) you'll lose all your contacts there in an instant. On the other hand if you build a social network based on phone numbers it's independent of the network provider. So if Signal discontinues its services tomorrow I can at least continue to maintain the contacts I've made by phone number and won't lose them completely.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:heading -->\n<h2 class=\"wp-block-heading\">Also helps fighting spam<\/h2>\n<!-- \/wp:heading -->\n\n<!-- wp:paragraph -->\n<p><a href=\"https:\/\/www.sueddeutsche.de\/wirtschaft\/signal-meredith-whittaker-whatsapp-messenger-datenschutz-1.5652005?reduced=true\">As Signal President Meredith Whittaker confirmed<\/a> there's another reason why Signal requires a phone number for registration: combating spam.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Of course it's relatively easy to obtain new phone numbers and misuse them for spam purposes in some countries. However, this isn't as easy or as inexpensive as email addresses for example. Therefore, the phone number requirement also makes it easier for Signal to combat spam and thus further increase Signal's user-friendliness.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:heading -->\n<h2 class=\"wp-block-heading\">Signal hides phone number by default<\/h2>\n<!-- \/wp:heading -->\n\n<!-- wp:paragraph -->\n<p>While you need a phone number to register in the beginning it doesn't mean that your phone number is exposed to all other Signal contacts. Since February 2024 Signal hides your phone number from your Signal contacts by default. If you use Signal, your phone number will no longer be visible to everyone you chat with (you can change that setting in the settings of Signal). There is only one exception: People who have your number saved in their phone\u2019s contacts will still see your phone number since they already know it.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>So in the end the fact that you need to register with a phone number just leads to one small piece of data: Signal itself knows that this phone number is registered at Signal. But since everything is end-to-end encrypted Signal doesn\u2019t know anything else. Your messages, media, profile, your group memberships, who you talk to all this information is encrypted and hidden from Signal. This is even true for your contact list.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:heading -->\n<h2 class=\"wp-block-heading\">Signal doesn't know your contacts<\/h2>\n<!-- \/wp:heading -->\n\n<!-- wp:paragraph -->\n<p>It seems to be logical: In order to determine which of my contacts are already on Signal, Signal must know my address book, right? If that would be true that would be a serious privacy problem.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Fortunately that is not the case for SIgnal. As Signal states its <a href=\"https:\/\/support.signal.org\/hc\/en-us\/articles\/360007061452-Does-Signal-send-my-number-to-my-contacts\">support pages<\/a>:<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:quote -->\n<blockquote class=\"wp-block-quote\"><!-- wp:paragraph -->\n<p>Signal developed a <a href=\"https:\/\/signal.org\/blog\/private-contact-discovery\/\">private contact discovery<\/a> process that enables Signal clients to efficiently and scalably determine whether the contacts in their address book are Signal users without revealing the contacts in their address book to the Signal service. Once your phone knows which of your contacts is a Signal user, it can optionally notify you when a new contact has started using&nbsp;Signal.<\/p>\n<!-- \/wp:paragraph --><\/blockquote>\n<!-- \/wp:quote -->\n\n<!-- wp:paragraph -->\n<p>Signal has made a significant technical effort to address this question in order to be user-friendly while protecting your data. Signal founder Moxie Marlinspike has explained the technical details and general considerations in two detailed blog posts. If you're interested in more detail, you can find them <a href=\"https:\/\/signal.org\/blog\/private-contact-discovery\/\">here<\/a> and <a href=\"https:\/\/signal.org\/blog\/contact-discovery\/\">here<\/a>.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:heading -->\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n<!-- \/wp:heading -->\n\n<!-- wp:paragraph -->\n<p>These findings can be summarized as follows: The fact that a phone number is required in order to register at Signal brings large benefits and very little drawbacks. <\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:heading {\"level\":3} -->\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n<!-- \/wp:heading -->\n\n<!-- wp:list -->\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>You get the benefits of being able to chat with your existing phone contacts immediately and without the hazzle of looking them up manually. <\/li>\n<!-- \/wp:list-item -->\n\n<!-- wp:list-item -->\n<li>You own your social contacts and are not depending on a commercial service with the danger of loosing all your contacts if the service shuts down.<\/li>\n<!-- \/wp:list-item -->\n\n<!-- wp:list-item -->\n<li>It's harder to fake profiles and easier for you to confirm that you are actually talking to the people you think you're talking to<\/li>\n<!-- \/wp:list-item -->\n\n<!-- wp:list-item -->\n<li>It's harder and more costly for spammers to register.<\/li>\n<!-- \/wp:list-item --><\/ul>\n<!-- \/wp:list -->\n\n<!-- wp:heading {\"level\":3} -->\n<h3 class=\"wp-block-heading\">Drawback<\/h3>\n<!-- \/wp:heading -->\n\n<!-- wp:list -->\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>Signal knows that this phone number is registered at Signal (and the date it was registered and last connected to the service). But that's it. Signal doesn't know your name, your messages, your calls, your profile, your metadata, your groups - not even your contacts. <\/li>\n<!-- \/wp:list-item --><\/ul>\n<!-- \/wp:list -->\n\n<!-- wp:paragraph -->\n<p>So in the end everybody has to decide which of these things are more important to them. As this article has tried to show there are certainly many good reasons to require a phone number at registration and it surely is one reason why Signal is the most popular secure and private messenger worldwide.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->","_et_gb_content_width":"","footnotes":""},"categories":[24],"tags":[],"class_list":["post-49840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why a phone number is necessary to register at Signal<\/title>\n<meta name=\"description\" content=\"Signal has good reasons for the phone number requirement. 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