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.
PCMag on MSN

iMessage Not Working on iOS 26? Apple Explains How to Fix It

Apple says the issue may stem from having an inactive SIM with the same number as your active SIM. To fix it, remove the inactive SIM and activate iMessage again.
iThinkDifferent

iMessage activation issues in iOS 26: how to fix them

OS 26 users are reporting iMessage activation issues caused by inactive SIM conflicts. Learn why this happens and how to fix it on iPhone.

Problem with iMessage activation: How to get rid of it in iOS 26

Apple's communication service can be jerky on current iPhones. If there are problems, you should follow these tips from the ...