1. newnews's Avatar
    Lumia 950XL supports dual SIM, however only one SIM connects to LTE network and another one connects to GSM/Edge. Now ATT is closing 2G network this year and many other country doing the similar. So the phone will not be able to use 2G any more, dual-SIM becomes one SIM.....
    05-11-2016 11:27 AM
  2. jmshub's Avatar
    Why do you think the second SIM is limited to 2G/Edge?
    Guytronic and aximtreo like this.
    05-11-2016 12:28 PM
  3. aetneerg83's Avatar
    You should show us the test that only one sim works with LTE.
    05-11-2016 01:04 PM
  4. Steve Adams's Avatar
    AFAIK, both sims run full LTE.
    05-11-2016 01:21 PM
  5. PepperdotNet's Avatar
    Sounds like a real non-troll question to me. Unfortunately it appears that if there are no networks supporting 2G anymore, your secondary SIM would become useless, unless it can be fixed in software. Both SIMs are capable of LTE, but only one at a time. The other one is limited to 2G.http://answers.microsoft.com/en-us/m...de59b9a?page=2
    05-11-2016 01:48 PM
  6. LuvMeSomeWP's Avatar
    AFAIK, both sims run full LTE.
    Correct, both slots support LTE. But only 1 can be running LTE at any given time, the other will be restricted to 2G.
    http://forums.windowscentral.com/mic...t-2g-data.html

    But OP is correct, as also indicated in the discussion linked above, once 2G networks are phased out, you won't be able to use that 2nd slot concurrently anyway - it'll still save you from physically swapping SIMs to switch networks, but only one SIM will be available at a time.
    05-11-2016 05:11 PM
  7. ElronTheElder's Avatar
    Is that limitation due to chipset or software?
    05-11-2016 06:31 PM
  8. pdaneophyte's Avatar
    Software
    05-11-2016 07:38 PM
  9. travis_valkyrie's Avatar
    Either SIM slot is LTE capable, but only one can be LTE at a time because there is only one LTE radio in the phone, you can't run 2 SIM cards on the same radio unless they run on a different radio (eg. 2G). There is a China variant of the Sony Xperia Z3 which has 2 LTE radios, but still you can only use the other LTE radio only in China which is pointless if you live somewhere else. So technically it is possible, but there would be limitations. As for now, I guess if one SIM slot breaks at least you can still use the other as a backup.
    05-11-2016 08:56 PM
  10. Steve Adams's Avatar
    well, that changes EVERYTHING for me. I was under the understanding that two of the LTE sim cards could be run concurrently. Well, not wasting my time on a 950xl then. no point. Guess I will buy a note for work, and just keep my 1020 for personal use.
    05-12-2016 04:34 AM
  11. Ibodnano's Avatar
    Only one Sim use LTE at a time, can the other use 3G?
    05-12-2016 06:07 AM
  12. ElronTheElder's Avatar
    Software
    In that case: no problems.
    05-12-2016 07:56 AM
  13. Noob1ee's Avatar
    Misleading title, I thought my 950XL would become obsolete.
    realwarder and Jakoh like this.
    05-12-2016 10:04 AM
  14. Mark F24's Avatar
    I have the dual 950XL but only run one sim, how could you potentially use both, at the same time anyway? Can you talk on LTE with sim 1, then what would you do to "potentially" use sim 2 for LTE? (at the same time)

    (Edit to add) I read the link above and it seems then that it will not even be able to monitor for incoming calls with this situation, but for those whoe need both sims to always be active hopefully MS will fix it in W10M.
    05-12-2016 05:41 PM
  15. Allen Rhodes's Avatar
    This thread should probably be stickied, imo. Very important info for those of us the are dual sims. I have AT&T in both and am not happy about Edge/2G being repurposed. There are many areas that don't have 3G let alone 4G or LTE. But to kill that off would essentially make my reasoning for buying the phone pointless. And it's not MS's fault. I'm hoping they can find a way to work it out and have the non data sim use 3G.
    05-12-2016 10:13 PM
  16. justop26's Avatar
    well, that changes EVERYTHING for me. I was under the understanding that two of the LTE sim cards could be run concurrently. Well, not wasting my time on a 950xl then. no point. Guess I will buy a note for work, and just keep my 1020 for personal use.
    It works exactly the same way on a Note. At least that's the way it did on my Note5.

    So it's NOT a Lumia 950 XL thing. It's a current-phone-design thing.
    05-12-2016 10:57 PM
  17. travis_valkyrie's Avatar
    Only one Sim use LTE at a time, can the other use 3G?
    Correct me if I'm wrong but afaik if SIM 1 is on 4G LTE for data then it'll automatically use 3G radio for calls and texts, so then that leaves the other SIM only for 2G.
    05-13-2016 12:09 AM
  18. Chintan Gohel's Avatar
    So how would a phone use 2 SIMS with both on LTE? Wouldn't the apps get confused as to which SIM to use to get the data?
    05-13-2016 05:43 AM
  19. anon(9668900)'s Avatar
    This is how all phones work everywhere. I've never seen a phone in which both operate with >2 G radios at the same time. Thankfully, India is very far off from removing 2G because of (1) feature phones (2) many rural areas having nothing but 2G.
    Chintan Gohel likes this.
    05-13-2016 07:30 AM
  20. Chintan Gohel's Avatar
    This is how all phones work everywhere. I've never seen a phone in which both operate with >2 G radios at the same time. Thankfully, India is very far off from removing 2G because of (1) feature phones (2) many rural areas having nothing but 2G.
    and most of the world too. I would really hate it if 2G was removed, it's so much efficient compared with 3/4G
    05-13-2016 07:48 AM
  21. migdier's Avatar
    So far from what I've read online, looks like this is just AT&T and not T-Mobile. I use 2 T-Mobile sims (personal & work) in mine so I'm hoping they don't do away with edge end of year.
    05-13-2016 08:33 AM

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