1. rohit bhattacharjee's Avatar
    Hi guys,
    I have a lumia 640 which I bought in india. now, il be moving to the united states in august, and was wondering whether I can just pop a sim from a US carrier into this phone without doing anything else.
    Is it possible? and if not, how to I fix it?
    Thanks in advance! :)
    04-27-2015 05:05 AM
  2. Don Geronimo's Avatar
    With GSM 850/900/1800/1900, and with WCDMA 850/900/1900/2100, you should have no problem using the phone in the US with 2G/EDGE speeds. IIRC you may have a problem with T-Mobile for 3G speeds, though, because they use a 1700 AWS. AT&T should be fine.

    My band knowledge is a little rusty, though, so a second opinion may be in order.
  3. Don Geronimo's Avatar
    With GSM 850/900/1800/1900, and with WCDMA 850/900/1900/2100, you should have no problem using the phone in the US with 2G/EDGE speeds. IIRC you may have a problem with T-Mobile for 3G speeds, though, because they use a 1700 AWS. AT&T should be fine.

    My band knowledge is a little rusty, though, so a second opinion may be in order.
    04-27-2015 06:11 AM
  4. RumoredNow's Avatar
    Should be fine on AT&T or any AT&T mvno (reseller).
    04-27-2015 11:01 AM

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