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My iPhone with AT&T is fully paid and changed the SIM card for use in Spain and Portugal. Some reason with Cellular data on or WiFi on, I am unable to send/receive text messages, although I am able to browse internet. When I try to text someone either in Spain or US, the pop-up message says to enable the iMessage. Will someone please help me figure the texting? Thank you
iPhone 6s Plus, iOS 12
Just to add to what ckuan already mentioned, see the following:
Set up iMessage and SMS/MMS on iPhone - Apple Support
If you can't send or receive messages on your iPhone, iPad, or iPod touch -Apple Support
If you get an error when trying to activate iMessage or FaceTime - Apple Support
Just to add to what ckuan already mentioned, see the following:
Set up iMessage and SMS/MMS on iPhone - Apple Support
If you can't send or receive messages on your iPhone, iPad, or iPod touch -Apple Support
If you get an error when trying to activate iMessage or FaceTime - Apple Support
SMS is a carrier feature and needs a text plan from your carrier.
For iMessage: You need a International SMS enabled iPhone : If you get an error when trying to activate iMessage or FaceTime - Apple Support
Your iPhone has 2 different types of messages. You have SMS text messages which show as a green bubble and iMessage that shows as a blue bubble.
If you're having trouble with green SMS Text Messages, try restarting your iPhone, check you have a cellular signal for SMS messages. Check out https://support.apple.com/en-au/HT204065
If it's the blue iMessage you're having trouble with, I'd recommend restarting your iPhone as well, check the date & time is right.
When going to Settings > Messages > is iMessage turned on? Do you get an error message when trying to turn it on?
Changing SIM Card on iPhone 6
