1. Windows Central Question's Avatar
    I was seeing the reviews of Nokia Lumia 640 dual sim version and I would like to know that, whether I can put 2 sims (GSM+GSM) in that phone.
    Also, does this phone supports 4G?
    05-22-2015 02:51 AM
  2. -8-'s Avatar
    By definition you can put 2 sims in a dual sim phone. There are actually 4 versions of the Lumia 640: 3G, 3G dual sim, 4G, and 4G dual sim. The problem is that not all the versions are available in all the markets.
  3. Alfa Kapa's Avatar
    You can in the dual sim version.
    The 640 dual sim doesn't support 4G, it supports up to HSDPA+ (otherwise known as 3.5G).
    Only the 640 single sim has a 4G version, but as far as I know, none of the current lumias support 4G and 2 sims simultaneously.

    But don't get fooled by the lack of 4g, HSDPA+ speeds are enough for casual browsing!
    05-22-2015 03:03 AM
  4. -8-'s Avatar
    By definition you can put 2 sims in a dual sim phone. There are actually 4 versions of the Lumia 640: 3G, 3G dual sim, 4G, and 4G dual sim. The problem is that not all the versions are available in all the markets.
    RumoredNow and xandros9 like this.
    05-22-2015 03:57 AM
  5. Animesh Kumar Das's Avatar
    i buy lumia 640 dual sim in india, i want to know onw thing , when i put my vodafone sim in sim 1 is its catch 3g signal, but when i put it in sim2 it only cathes 2g signals. i choose connection speed as 3g. Is only sim1 slot support 3G in lumia 640??????
    10-24-2015 10:48 AM
  6. RumoredNow's Avatar
    i buy lumia 640 dual sim in india, i want to know onw thing , when i put my vodafone sim in sim 1 is its catch 3g signal, but when i put it in sim2 it only cathes 2g signals. i choose connection speed as 3g. Is only sim1 slot support 3G in lumia 640??????
    Correct... Only one Slot at a time will access 3G/H+/LTE, the other stays GSM or 2G.
    10-24-2015 01:00 PM

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