1. molimelight's Avatar
    I bought an ATT version of the 640 and want to unlock it to possibly use it on T-Mo but I may switch to ATT. I know I lose some things like Wi-Fi Calling on T-Mo if I unlock it and use it with them but I was wondering if unlocking it causes it to lose anything on the ATT side if I decide to use it with ATT, either before or after I use it with T-Mo.
    01-30-2016 01:54 PM
  2. ven07's Avatar
    Doubt it.. the gsm bands and such don't change when unlocking the phone and I don't think att will actively track your phone to find out what you're upto
    libra89 likes this.
    01-30-2016 02:50 PM
  3. barber76's Avatar
    I bought an ATT version of the 640 and want to unlock it to possibly use it on T-Mo but I may switch to ATT. I know I lose some things like Wi-Fi Calling on T-Mo if I unlock it and use it with them but I was wondering if unlocking it causes it to lose anything on the ATT side if I decide to use it with ATT, either before or after I use it with T-Mo.
    I can't answer your question, but still have two notes:
    Just to clarify - you don't lose WiFi calling because you unlock it. You don't have it in because you have ATT version in the first place.
    Another thing that is missing from ATT version for unknown reason is SMS delivery confirmation option. Looks like nobody really cares. Now, after 3 months of using 640 I'm used to its absence, too, but first couple weeks it was driving me crazy.
    libra89 and ven07 like this.
    01-30-2016 04:45 PM
  4. ven07's Avatar
    Another thing that is missing from ATT version for unknown reason is SMS delivery confirmation option. Looks like nobody really cares
    is that an att thing or just windows 10 mobile issue?

    edit: assuming you are using w10m
    01-30-2016 11:42 PM
  5. molimelight's Avatar
    Thanks for the help folks. My T-Mo signal was so weak here at the house, I depended on the Wi-Fi Calling. But I just changed to a local cable provider and have a home line now. Friends' phones that have ATT are good here so I don't think the loss of Wi-Fi calling will be a big thing. I understand it's only offered on the T-Mo branded phones. I just jumped on the $29.88 price on the 640 at Wal-Mart and I'm going to make the jump to ATT after my T-Mo pre-pay runs out. The 640 will be a step up from my 520 and it has Denim, which I don't think is ever coming to the 520 on T-Mo.
    ven07 likes this.
    01-30-2016 11:47 PM
  6. libra89's Avatar
    is that an att thing or just windows 10 mobile issue?

    edit: assuming you are using w10m
    I think it;s just a thing with the AT&T firmware for this phone. For some reason, the T-mobile firmware has more options there in 8.1 even.
    ven07 likes this.
    01-31-2016 12:18 AM
  7. ML10's Avatar
    Thanks for the help folks. My T-Mo signal was so weak here at the house, I depended on the Wi-Fi Calling. But I just changed to a local cable provider and have a home line now. Friends' phones that have ATT are good here so I don't think the loss of Wi-Fi calling will be a big thing. I understand it's only offered on the T-Mo branded phones. I just jumped on the $29.88 price on the 640 at Wal-Mart and I'm going to make the jump to ATT after my T-Mo pre-pay runs out. The 640 will be a step up from my 520 and it has Denim, which I don't think is ever coming to the 520 on T-Mo.
    I made the same upgrade because I didn't know when the hell denim was coming to my 521.
    01-31-2016 08:13 AM
  8. gordonfink's Avatar
    I've been using an unlocked 640 with ATT for a while. I put W10 on it prior to doing anything else with it. In W10, when you send a text, the message shows. When it is delivered, the time comes up under it.

    There was a setting to do delivery conf (can't remember if that was 8.1or 10), but it sent me a text confirming every text I sent, which was too annoying. I like the way it works in W10.

    As for other functionality - my phone does everything an ATT locked phone would (it was an ATT model to begin with though, if that matters).
    ven07 likes this.
    01-31-2016 09:01 AM
  9. libra89's Avatar
    I've been using an unlocked 640 with ATT for a while. I put W10 on it prior to doing anything else with it. In W10, when you send a text, the message shows. When it is delivered, the time comes up under it.

    There was a setting to do delivery conf (can't remember if that was 8.1or 10), but it sent me a text confirming every text I sent, which was too annoying. I like the way it works in W10.
    I think this is only a W10 thing, because I had the same thing there too, and I agree with you, it is really annoying.
    ven07 likes this.
    01-31-2016 02:39 PM
  10. barber76's Avatar
    is that an att thing or just windows 10 mobile issue?

    edit: assuming you are using w10m
    No, it's 8.1. As I understand from further posts, this setting presents in WM10, even if it is put on top of ATT firmware.
    01-31-2016 03:41 PM
  11. ven07's Avatar
    I looked for the setting after reading your post and it isn't there (turn message delivery texts on and off), but as gordon pointed out, the time showing up under your text is the new indicator. Didn't know this lol

    Also the setting was present in 8.1, turned it off, because it was annoying after a bit. Never thought to look for it after I joined the insider program
    libra89 likes this.
    02-01-2016 01:23 AM
  12. barber76's Avatar
    I looked for the setting after reading your post and it isn't there (turn message delivery texts on and off), but as gordon pointed out, the time showing up under your text is the new indicator. Didn't know this lol

    Also the setting was present in 8.1, turned it off, because it was annoying after a bit. Never thought to look for it after I joined the insider program
    Very strange. Because that's my old post on this matter and you can see I don't have this option at all in 8.1. Not even greyed out, just absent from the phone menu.
    02-01-2016 10:46 AM
  13. ven07's Avatar
    That is strange idd. Guess it really is an att thing. Had the option on my 925 and 920, but both devices were bought unlocked
    02-01-2016 04:29 PM

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