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No. With one phone number, you can only use Signal on one mobile phone at a time. However, you can link up to five other devices, such as your desktop computer or iPad.
If Signal is already registered with your phone number on another smartphone, that registration will become inactive as soon as you register Signal on a new phone.
If you use multiple SIM cards (dual SIM), you have to choose one number to use Signal with. Read also: Does Signal work with dual SIM phones?
