30 replies on Dual SIM - What is it? What does Dual SIM mean? How does Dual SIM work?

  1. Cawtau says:

    Have any of the dual-SIM phone manufacturers made concessions for having the UMTS or WCDMA (3G) network as the non-preferred SIM or second slot network? I’m not suggesting additional functionality by using that network. I understand the limitation of having a single set of radios. However, many mobile providers do not operate 2G networks anymore. Furthermore, many of those who do are stepping away from GSM. In fact, North American giants AT&T and Rogers both plan to decommission their GSM networks and reallocate those bands/frequencies by 2017.

    If there are no allowances for the non-preferred or second slot SIMs to access the 3G network for voice and SMS only, then those fancy dual-SIM phones will eventually become single-SIM phones with a fancy SIM holder.


  2. carol says:

    I have been thinking about getting a dual sim phone but wanted to see what it entailed first. Unfortunately there isn’t much out there on the specifics. This piece made it so much clearer. Thanks a bunch!

  3. MT says:

    Great article. Do the Moto G3, G4, etc. with dual sims support dual SIM Dual Standby? Thanks.

  4. Christina says:

    I have a Samsung J1 dual sim cellphone. Which one of the 3 modes does it support? Tx.

  5. Beretta9mmps91@gmail.com says:

    Is it possible for my Samsung galaxy s6,,it’s really a s7, to be hacked by some one who has the second sim card numbers,I only see one sim card, is the other inside my phone,,,can’t take out the battery, from factory…..???,, help…

  6. Peter says:

    Nobody talked about dual sims each of which can be used in a different country. e.g.: one for USA and/ the other for european countries. Any ideas and suggestions???

  7. Ron says:

    I have a US and non US sim. I’m out of the US most of the time and at that time only need the US sim to receive texts and verification requests from financial institutions, etc. I could get away with a cheap phone to receive the US texts but wonder if a dual sim phone would serve my needs as well.
    If a text comes in on my US sim and I’m using Whatsapp or online using wireless (not data), if the phone is DSDS will I receive the text?

  8. Ian says:

    This is a very helpful knowledge base article on the topic of dual sim smartphones.The information provided was insightful because it helped me understand the various aspecs of a dual simcard smartphone. In addition the knowledge I acquired readind the article was instrumental in my purchase of my new smart phone.



  9. Ben says:

    So could I have one sim that has a call-only plan (very low data), and one sim that is data-only?
    Also the Oppo R11s says it is “Dual SIM Standby”, which I assume would be Dual SIM Dual Standby?

  10. Gayle says:

    I have just purchased a new Oppo 73 dual sim phone
    I want to be able to use this capacity for work….not carrying 2 phones around anymore
    1. Can I have 2 different phone providers?
    2. Are the missed calls texts on the one sim logged when using the other?
    3. Any positives any negatives?

  11. courtenay says:

    thanks. very helpful.

  12. Amy says:

    Thanks! It helps clear it up

  13. Rhod says:

    Nice! I have scanned a bunch of articles looking for this succinct answer to my question. I WANT dual Sim.

  14. Kakooza Wazzir says:

    I have a Huawei mate20 pro,I want to activate dual sim active,kindly guide me.

  15. Neil T says:

    I’m looking at a BlackBerry Key2 LE (BBE100-4) Dual SIM device, but am not sure what type of dual sim capability it provides, are you able to explain?

  16. Lilian Crozett says:

    If my sim is stuck in phone with dual sim cards can i use the other and how?

  17. Jim says:

    I have a dual sim phone. 4G,/2G SIM cardd. The 2G is useless.
    I travel a great deal and need two 4G SIM chips such that I do not need to use an auxiliary router with a 4G SIM with my phone hotspot. Having to carry routers is cumbersome .
    Two 4G dual sim phones is a must.. Otherwise buy a router.

  18. Jennifer M. says:

    I’m going to buy a plum compass 4G LTE dual sim (dual standby) smartphone in a couple days and I was very confused about what dual sim meant when I was researching the phone. I just figured at 35 y/o I was already too old to know what that meant lol. So seeing this article, even if it is a couple years old itself, really cleared it up for me. I was able to understand it without feeling like a dummy, I appreciate that! Well done to the author of this article, you did a great job!!
    Thank You!! 🙂

  19. Chris says:

    I am considering buying a Huwai p30 pro. I am from the UK and now live in Spain. I currently have a UK sim with a UK phone number, which includes free roaming. Can I use the other sim slot for a Spanish calls & texts only pay as you go sim?

  20. Brandon says:

    My main concern about this is possibly getting business and personal life mixed up.

    Is there a way that you can tell which SIM card people are calling?, is there a way you can tell between business and personal?

    Example: color coded contacts list.

  21. Vedprakash says:

    Good topic you covered. Can You suggest smart phone which has Dual sim dual active in the market on VoLTE base?

  22. Gerard says:

    I cant find a dual sim dual active phone – can you recomend one

  23. Alissa says:

    Do dual sim phone estate work with only one sim card in it?

  24. Ken says:

    Duel sim one bill pay one pay as you go can they be used in the one phone ?

  25. Louis Danziger says:

    What about a list of fully active dual SIM phones?

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