{"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":"perche-e-necessario-un-numero-di-telefono-per-registrarsi-a-signal","status":"publish","type":"post","link":"https:\/\/aboutsignal.com\/it\/blog\/why-a-phone-number-is-necessary-to-register-at-signal\/","title":{"rendered":"Perch\u00e9 \u00e8 necessario un numero di telefono per registrarsi a Signal"},"content":{"rendered":"<p>Il problema del numero di telefono. \u00c8 probabilmente una delle critiche pi\u00f9 comuni che si sentono riguardo Signal. E questo \u00e8 tutto dire. Altrimenti, con la sua attenzione alla sicurezza e alla privacy, pur mantenendo la facilit\u00e0 d'uso, Signal offre pochi motivi di critica (<a href=\"https:\/\/aboutsignal.com\/it\/blog\/critiche-di-signal-e-come-signal-risponde\/\">abbiamo verificato i fatti delle critiche e dei miti comuni su Signal in un post separato sul blog<\/a>). Ma perch\u00e9 hai bisogno di un numero di telefono per registrarti a Signal? Qui chiariremo la questione e mostreremo che ci sono buone ragioni per farlo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Come funziona il processo di registrazione a Signal?<\/h2>\n\n\n\n<p>Prima i fatti. Per registrarsi a Signal hai bisogno di un numero di telefono. Pu\u00f2 essere un numero di cellulare o di rete fissa. Questo numero viene poi confermato durante la registrazione con un codice di verifica e collegato al tuo account Signal. Puoi trovare i dettagli sulla registrazione a Signal su questa <a href=\"https:\/\/support.signal.org\/hc\/it\/articles\/360007318691-Register-a-phone-number\">pagina di supporto ufficiale<\/a>.<\/p>\n\n\n\n<p>Ma qual \u00e8 il motivo della decisione di richiedere un numero di telefono durante la registrazione? Perch\u00e9 non ci si pu\u00f2 semplicemente registrare a Signal utilizzando un indirizzo email o un nome utente?<\/p>\n\n\n\n<p>Questa \u00e8 la risposta che la presidente di Signal, Meredith Whittaker, ha dato a questa esatta domanda nel 2022:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>I numeri di telefono consentono alle persone di \"importare\" il loro grafico sociale in Signal e, cosa pi\u00f9 importante, portarlo con s\u00e9 se decidono di smettere di usarlo. La rete di contatti che le persone portano con s\u00e9 tramite i numeri di telefono aiuta a connettersi rapidamente con amici e colleghi. E, naturalmente, quella rete \u2013 la rete di persone a cui tieni, con cui vuoi collaborare e con cui vuoi parlare \u2013 \u00e8 il cuore di un servizio di messaggistica funzionante.\ns<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Signal senza numero di telefono? \u2013 Vuoto e senza successo<\/h2>\n\n\n\n<p>Come sarebbe un mondo dove Signal non richiederebbe un numero di telefono per la registrazione? Dopo l'installazione Signal, semplicemente non sapresti quali dei tuoi amici possono essere contattati tramite Signal. Ovviamente potresti chiamare tutti i tuoi amici e chiedere se sono iscritti a Signal e qual \u00e8 il loro nome utente. Ma non \u00e8 molto pratico per un'app di messaggistica. E Signal crede che solo un'app pratica sia un'app di messaggistica utile e sicura. Dopotutto, qual \u00e8 il valore di un'app di messaggistica (teoricamente) sicura ma che nessuno usa? Esattamente. Ecco perch\u00e9 Signal ha optato per un compromesso.<\/p>\n\n\n\n<p>Registrandoti con il tuo numero di telefono, puoi iniziare da subito. Chiunque installi Signal pu\u00f2 vedere quali dei contatti esistenti sono gi\u00e0 presenti e pu\u00f2 iniziare immediatamente a scrivere messaggi sicuri. Questo spiega il grande successo di Signal. Perch\u00e9 a differenza di molte altre app di messaggistica crittografate posso iniziare da subito e i miei amici vengono avvisati che ora sono attivo su Signal.<\/p>\n\n\n\n<p>Inoltre, come afferma Meredith Whittaker nella citazione, questo ti permette di rimanere il \"proprietario\" del tuo social network il pi\u00f9 possibile. Supponendo che Facebook chiuda domani (si pu\u00f2 ancora sognare), perderai tutti i tuoi contatti in un istante. D'altra parte, se crei un social network basato sui numeri di telefono, \u00e8 indipendente dal gestore di rete. Quindi, se Signal interromper\u00e0 i suoi servizi domani, almeno potr\u00f2 continuare a mantenere i contatti che ho creato tramite numero di telefono e non li perder\u00f2 del tutto.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aiuta anche a combattere lo spam<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.sueddeutsche.de\/wirtschaft\/signal-meredith-whittaker-whatsapp-messenger-datenschutz-1.5652005?reduced=true\">La presidente Meredith Whittaker ha confermato<\/a> che c'\u00e8 un altro motivo per cui Signal richiede un numero di telefono per la registrazione: la lotta allo spam.<\/p>\n\n\n\n<p>Naturalmente, in alcuni paesi \u00e8 relativamente facile ottenere nuovi numeri di telefono e utilizzarli impropriamente per scopi di spam. Tuttavia, non \u00e8 cos\u00ec facile o economico come, ad esempio, ottenere un indirizzo email. Pertanto, il requisito del numero di telefono aiuta Signal a combattere lo spam e quindi aumenta ulteriormente la facilit\u00e0 d'uso.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signal nasconde il numero di telefono per impostazione predefinita<\/h2>\n\n\n\n<p>Sebbene sia necessario un numero di telefono per registrarsi, ci\u00f2 non significa che il tuo numero di telefono sia esposto a tutti gli altri contatti su Signal. Da febbraio 2024 Signal nasconde il tuo numero di telefono dai tuoi contatti per impostazione predefinita. Se usi Signal, il tuo numero di telefono non sar\u00e0 pi\u00f9 visibile a tutti coloro con cui chatti (puoi modificare questa impostazione nelle impostazioni di Signal). C'\u00e8 solo un'eccezione: le persone che hanno gi\u00e0 il tuo numero salvato nei contatti del loro telefono, vedranno il tuo numero di telefono dato che lo conoscono gi\u00e0.<\/p>\n\n\n\n<p>Quindi, alla fine, il fatto che tu debba registrarti con un numero di telefono porta solo a un piccolo dato: Signal sa soltanto che quel numero di telefono \u00e8 registrato su Signal. Ma poich\u00e9 tutto \u00e8 crittografato end-to-end, Signal non conosce nient\u2019altro. I tuoi messaggi, i tuoi media, il tuo profilo, in quali gruppi sei, con chi parli \u2013 tutte queste informazioni sono crittografate e nascoste a Signal. Questo vale anche per la tua lista di contatti.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signal non conosce i tuoi contatti<\/h2>\n\n\n\n<p>Sembra logico: per determinare quali dei miei contatti sono gi\u00e0 presenti Signal, Signal deve conoscere la mia rubrica, giusto? Se fosse vero, sarebbe un serio problema di privacy.<\/p>\n\n\n\n<p>Fortunatamente non \u00e8 questo il caso di Signal. Come Signal afferma nella sua <a href=\"https:\/\/support.signal.org\/hc\/it\/articles\/360007061452-Does-Signal-send-my-number-to-my-contacts\">pagina di supporto<\/a>:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Signal ha sviluppato la <a href=\"https:\/\/signal.org\/blog\/private-contact-discovery\/\">scoperta di contatti privata<\/a> attraverso un processo che permette ai client di Signal di determinare in modo efficiente e scalabile se i contatti nella rubrica sono utenti Signal senza rivelare i contatti presenti nella rubrica al servizio di Signal. Una volta che il tuo telefono sa quale dei tuoi contatti \u00e8 un utente, pu\u00f2 facoltativamente avvisarti quando un nuovo contatto ha iniziato ad utilizzare Signal.<\/p>\n<\/blockquote>\n\n\n\n<p>Signal ha compiuto notevoli sforzi tecnici per rispondere a questa domanda, in modo da risultare intuitivo e al tempo stesso proteggere i tuoi dati. Il fondatore di Signal Moxie Marlinspike ha spiegato i dettagli tecnici e le considerazioni generali in due articoli dettagliati sul blog. Se siete interessati a maggiori dettagli, potete trovarli <a href=\"https:\/\/signal.org\/blog\/private-contact-discovery\/\">qui<\/a> e <a href=\"https:\/\/signal.org\/blog\/contact-discovery\/\">qui<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sintesi<\/h2>\n\n\n\n<p>Questi risultati possono essere riassunti come segue: il fatto che sia richiesto un numero di telefono per registrarsi a Signal porta grandi benefici e pochissimi svantaggi. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vantaggi<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Potrai usufruire del vantaggio di poter messaggiare immediatamente con i tuoi contatti telefonici esistenti, senza la seccatura di doverli cercare manualmente. <\/li>\n\n\n\n<li>Sei il proprietario dei tuoi contatti social e non dipendi da un servizio commerciale con il rischio di perdere tutti i tuoi contatti se il servizio dovesse interrompersi.<\/li>\n\n\n\n<li>\u00c8 pi\u00f9 difficile falsificare i profili ed \u00e8 pi\u00f9 facile per te confermare che stai effettivamente parlando con le persone con cui pensi di parlare<\/li>\n\n\n\n<li>Per gli spam \u00e8 pi\u00f9 difficile e costoso registrarsi.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Svantaggi<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Signal sa che questo numero di telefono \u00e8 registrato a Signal (e la data di registrazione e dell'ultima connessione al servizio). Ma questo \u00e8 tutto. Signal non conosce il tuo nome, i tuoi messaggi, le tue chiamate, il tuo profilo, i tuoi metadati, i tuoi gruppi e nemmeno i tuoi contatti. <\/li>\n<\/ul>\n\n\n\n<p>Quindi, alla fine, ognuno deve decidere quali di queste cose siano pi\u00f9 importanti per s\u00e9 stesso. Come questo articolo ha cercato di mostrare, ci sono certamente molte buone ragioni per richiedere un numero di telefono durante la registrazione e sicuramente questo \u00e8 uno dei motivi per cui Signal \u00e8 l'app di messaggistica sicura e privata pi\u00f9 popolare al mondo.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Signal ha buone ragioni per richiedere il numero di telefono.<\/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 v27.4 - 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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