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Signal allows Android phones and iPhones to be linked as secondary devices to a primary device, such as an Android phone or an iPhone. Read more about it here: linked Android phones and linked iPhones.
With one phone number, you can use Signal on multiple devices simultaneously. 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?
