From a Metro Rep
I have found that T-Mobile devices tend to automatically revert back to the TM APN.
If you can get the device to delete the original APN, this problem usually goes away. 
T-Mobile usually has less problems than AT&T though.
---------- Post added at 08:05 PM ---------- Previous post was at 07:56 PM ----------
I sell Metro and still can not always find a fix. Sometimes the original carrier can get them to work, other times not so.I am having the same problem. Can't find how to fix it.
---------- Post added at 08:05 PM ---------- Previous post was at 07:56 PM ----------
I sell Metro and still can not always find a fix. Sometimes the original carrier can get them to work, other times not so. I have found that T-Mobile devices tend to automatically revert back to the TM APN. If you can get the device to delete the original APN, this problem usually goes away. T-Mobile usually has less problems than AT&T though.i have metro pcs and i have no data right now, the htc one can make calls and its unlocked but i cant access the internet nor anything that requires a connection. i spoken to metro pcs twice already and they only told me to change 2 things from the apn settings, i am on custom rom right now, do i have to flash back to stock???? please help me out