[Sedp23]

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?

[libra89]

Did she put in her APN for T-Mobile?

[Sedp23]

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

[libra89]

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]

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

[srcpt]

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.

[STORMY13]

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.

[BeyondtheTech]

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?

[libra89]

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.