How to activate a new or used iPhone and get cell service

You can activate a new or used iPhone for use with a cellular service provider in a few steps. Here's how to activate any iPhone, or troubleshoot it.
Tech Advisor on MSN

How to switch SIMs on iPhone, including eSIM

Changing physical SIM cards on your phone is always a fiddly business. First, you have to root for the little SIM tray tool ...