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Yes. While Signal can only be registered with one phone number or one account ID on a single primary device, Signal allows Android phones and iPhones to be linked as secondary devices to a primary device. Read more about it here: linked Android phones and linked iPhones.
Once a device is linked, your messages and chats are synced across all connected devices, so you can continue chats seamlessly.
You can link up to five additional devices to your primary device. Read more: What are Linked devices on Signal?
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?
