09-18-2020 01:19 PM - edited 01-05-2022 01:15 PM
09-18-2020 02:02 PM
Haha, okay, I fixed it by myself. If you have had another carrier I guess sometimes it leaves behind some data that overrides the new carrier. I went to settings, general, and profile. Deleted the one that was there, and now my data is working! I’m using it to write this. 😉 Hope that helps anyone else who had my same problem!
09-18-2020 01:31 PM
Try running it through iTunes
1. Insert new working SIM - do not turn phone on (if SIM is already in, turn off)
2. Connect to computer with USB cable.
3. Start iTunes if it doesn't auto run
4. iPhone will switch on. Wait until iTunes registers it and checks for updates
5. Install the carrier profile update (if offered, if not, go to step 6)
6. Disconnect and restart. From @Luddite