How to edit APN in att?
it is grey and not allow to change.
Even I add new apn, it will change to old apn automaticlly.
How can I fix it in the new apn?
You should be able add a -new- APN, then once saved, you can set the new APN active. Just name it something different from the default APN.....like MY_ATT_APN or something.
If you continue to have issues, I'll check my friends X to see exactly how I did it. I put his AT&T Moto X on H2O wireless (which requires adding an APN).