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No. Signal can only be registered with one phone number at a time per device. On a single device, you cannot use multiple phone numbers with Signal.
If you use multiple SIM cards (dual SIM), you have to choose one number to use Signal with.
Apart from that, Signal works the same on dual SIM phones as on single SIM phones. Signal can use any connection on your phone, including Wi-Fi and mobile data from either SIM card.
