Hello JohnnyRedDevil,
Thank you for using Apple Support Communities! It sounds like you're unable to send or receive SMS/MMS on your iPhone after traveling to another country. You're in the right place to find a resolution.
If you don't have an international data plan with your carrier, it can be normal for cellular features such as messaging not to work. Since it sounds like you're now using a local carrier, let's start by trying the suggestions here:
About cellular data roaming options for your iPhone and iPad - Apple Support
- Turn on Airplane Mode for about 30 seconds. Then turn it off again and let your iPhone automatically select the best network.
- If you see No Service in the status bar of your iPhone, open Settings and tap Cellular, or Cellular Data, or Mobile Data. Tap Cellular Data Options and make sure that Data Roaming is on. Then, to check that international roaming is turned on for your account, contact your carrier.
- If the date and time are wrong after you arrive, go to Settings > General > Date & Time. Make sure that Set Automatically is turned on.
Still need help? If so, here's what to do:
- Go to Settings > Cellular > Cellular Network and turn off Automatic. Wait until available networks appear, which might take two minutes.
- Tap the carrier that you want.
- Go back to the main Settings screen and wait for your iPhone or iPad to connect to the network.
- If you still need help, try a different SIM card or contact your carrier for more information."
You may also want to check that you have Send as SMS, MMS Messaging, and Group Messaging enabled under Settings > Messages. If you're still unable to send or receive SMS/MMS, try these steps next:
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
If the behavior persists, we'd suggest contacting EE to confirm that you have an active cellular data and messaging plan as SMS/MMS is a carrier controlled feature. If you are using Group MMS as opposed to group iMessage, this would also explain why you're no longer receiving group messages as well.
Take care.