have a HTC One M8 (AT&T) Unlocked to T-Mobile - mobile data will not work

    Have a HTC One M8. Branded to AT&T but was unlocked to T-Mobile. I cannot get the mobile data to work. Wi-Fi works fine

    Also can't get my phone book to show the phone numbers I imported wirelessly thru HTC Push transfer from my old phone. It only

    shows e-mail address from my g-mail account. Any help would be greatly appreciated. Thanks

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