Most of my friends have iphone and has activated imessage and i did too but why can't i text them? Why are my messages not turning to blue? Also i can text some people's locally and internationally and some I can't! I have reboot the phone turn on and off imessage still the same problem.
iPhone 7 Plus, iOS 13
See If you get an error when trying to activate iMessage or FaceTime https://support.apple.com/en-us/HT201422 and
If you can't send or receive messages on your iPhone, iPad, or iPod touch https://support.apple.com/en-us/HT204065
See If you get an error when trying to activate iMessage or FaceTime https://support.apple.com/en-us/HT201422 and
If you can't send or receive messages on your iPhone, iPad, or iPod touch https://support.apple.com/en-us/HT204065
Have you tried the steps in the articles below?
How to forward text messages on your iPhone.
SMS Relay - Set up and use –Yosemite/ iOS 8.
SMS Relay - Set up and use –Yosemite/ iOS 8 (2).
Imessage
