You need to find the good settings, and delete others.
Need only 2 APNs, DATA and MMS. Sometimes only one is OK.
For MMS you need to select it with the dot where you can see APNs names.
It's good to see other Android phone with same provider to exclude problem of settings.
Wich one is it, and where are you from?
I'm tired, not English, sorry if not easy to understand mate.