1. Sedp23's Avatar
    I have a friend on a 640 she unlocked from att, she put her tmobile sim in and it works fine but when she's on a call she can't use her data

    Is there some kind setting she needs to change in sim settings so she can use data while on calls?
    01-24-2017 08:06 AM
  2. libra89's Avatar
    Did she put in her APN for T-Mobile?
    01-24-2017 08:15 AM
  3. Sedp23's Avatar
    Did she put in her APN for T-Mobile?
    I doubt it it's her first unlocked phone she just popped in her sim. How do you do that?

    Sent from Idol 4S
    01-24-2017 09:01 AM
  4. libra89's Avatar
    I doubt it it's her first unlocked phone she just popped in her sim. How do you do that?

    Sent from Idol 4S
    Have her follow these directions and put in these APN settings: https://support.t-mobile.com/docs/DOC-28065

    She should also do the mms too, so that she can get (and send) MMS.

    After saving it, turn the phone off and then back on.

    Edit: She only needs to pay attention to the APN and data settings part, ignore the rest.
    Sedp23 likes this.
    01-24-2017 09:22 AM
  5. Sedp23's Avatar
    Have her follow these directions and put in these APN settings: https://support.t-mobile.com/docs/DOC-28065

    She should also do the mms too, so that she can get (and send) MMS.

    After saving it, turn the phone off and then back on.

    Edit: She only needs to pay attention to the APN and data settings part, ignore the rest.
    Thanks will send it to her

    Sent from Idol 4S
    libra89 likes this.
    01-24-2017 10:07 AM
  6. srcpt's Avatar
    An unlocked ATT 640 does not use all the LTE bands that T-Mobile uses unless the phone is reflashed with the T-Mobile ROM. This may be affecting her phones behavior. Google "rebrand ATT L640" and you will get lots of information.
    Sedp23 likes this.
    01-24-2017 11:21 AM
  7. STORMY13's Avatar
    Be advised that you/she will have to roll back to 8.1 to do this.

    Just did mine today following this guide,

    https://www.reddit.com/r/windowsphon...640_unlocking/

    worked like a charm. Now in the process of getting back to 15014, which is taking far longer to do than the debranding did.
    Sedp23 likes this.
    01-24-2017 02:29 PM
  8. BeyondtheTech's Avatar
    Anyone know if or when T-Mobile will officially bless their variant of the 640 with Windows 10, or do we all just have to do the Insider thing?
    03-22-2017 02:07 PM
  9. libra89's Avatar
    Anyone know if or when T-Mobile will officially bless their variant of the 640 with Windows 10, or do we all just have to do the Insider thing?
    Insider is your best bet. T-Mo has given up on that phone.
    03-22-2017 04:14 PM

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