How to activate a new or used iPhone for use with a cellular service provider, or troubleshoot itYou can activate a new or used iPhone in several steps. If you're setting up a new or used iPhone, you'll need to activate your iPhone with a cellular service provider. Activation is the initial part of the iPhone's setup wizard and you should be able to complete it in just a few minutes, as long as you have a SIM card that's activated for your cellular carrier's service plan. If you have activation problems, there are a number of steps you can take to troubleshoot, including resetting the SIM
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