1. Ser_Jake's Avatar
    Hey, so I'm in Vietnam and just lost my 830 (RIP). I'm now planning on buying a 640XL while I'm here, but I need to know if I can use it on AT&T when I get back to the US. Can anyone help me out with this?
    06-15-2015 11:12 AM
  2. RumoredNow's Avatar
    Make sure it has (3G) WCDMA 850 and 1900 MHz. Also LTE Bands 2, 4 and 17. No real need to worry about the 2G radio. It's pretty much universal.

    Based on what I've seen of the 640 XL coming out of Asia it has over a dozen LTE Bands and a pentaband 3G radio and should cover what you need in Vietnam, back home and most any part of the world.
    06-15-2015 11:55 AM
  3. Ser_Jake's Avatar
    Thank you so much for answering! I posted this before signing in, so I can't reply. Looking at the Microsoft website, these are the network stats it gives:
    GSM: 850 MHz, 900 MHz, 1800 MHz, 1900 MHz
    Data download speed up to pass GSM: 296.0 kbps EGPRS
    Speed ​​Maximum upload data via GSM: 236.8 kbps EGPRS
    WCDMA: Band 1 (2100 MHz), Band 2 (1900 MHz), Band 5 (850 MHz), Band 8 (900 MHz)
    Data download speed up to over WCDMA: 42.2 Mbps (Cat 24)
    Speed ​​Maximum upload data via WCDMA: 5.76 Mbps (Cat 6)

    Looks like the 3G is covered, but I don't see any of the LTE options you mentioned. This is the dual SIM version. Not sure if that makes a difference.
    06-15-2015 12:23 PM
  4. Woodman1914's Avatar
    Ser_Jake, this was posted in another thread, so I'll paste it here: for US LTE, you must get the dual-sim version (RM-1096) to get US LTE bands covered (700 MHz, 1700, and 1900) : Microsoft Lumia 640 XL LTE Dual SIM Specifications - Microsoft - Global

    The single-sim LTE variant (RM-1065) does not support US LTE bands: Microsoft Lumia 640 XL LTE Specifications - Microsoft - Global

    RumoredNow and Intense Soul like this.
    06-15-2015 02:06 PM
  5. RumoredNow's Avatar
    Seems you are looking at a variant without LTE. That fits with Vietnam. I don't believe they have any LTE deployed.
    06-15-2015 09:16 PM

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