Edit your phone number detail: Once you’ve rebooted the iPhone, check if Phone number details on your iPhone reflect the new number. But for a good measure, power down your device and wait for about 5 minutes before proceeding to the next step.ģ. Power down and wait: Usually, people jump to step #3 from here and it works. To do so: head over to Settings → scroll down and tap on Messages → switch OFF iMessage.Ģ. Insert the New SIM and Turn off iMessage: The first thing you need to do is insert the new SIM and turn OFF iMessage.
