If you see the SOS Only message pop up on your iPhone, a simple restart or toggling Airplane mode on and off can help fix the ...

You can’t send or receive messages at all. You can send and receive messages, but your bubbles are green instead of blue. iMessage tells you that a message was unable to be delivered.

Here's how to fix your text messages. WhatsApp now lets users edit their messages, but you may not guess how. iMessage doesn't make it obvious either.