You can't change your phone number in the Signal app directly, but you can deregister your old number and then update the app ...
Just because you have a set phone plan and have had your phone for a certain amount of time doesn't mean you can't change your number. If you're looking to get your phone number changed to a different ...
You can change your phone number on WhatsApp whether you're still using the same phone, or you're using a new phone.
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