The APN determines whether you get MMS, not how good it is. But if you can't edit the APN, create a new one, dill it in with the new information, then switch to it. If it works better, delete the old one.
The APN determines whether you get MMS, not how good it is. But if you can't edit the APN, create a new one, dill it in with the new information, then switch to it. If it works better, delete the old one.