How does dual SIM mobile work

Gone are the days when you just had one sim and one phone, your choices were pretty limited if you wanted to use another sim. You either purchased a second cell phone or you flipped between sims. Today however the availability of dual sim phone has changed everything. You can have two sims running in one phone and switch between services with ease.

How does a dual SIM phone work?

Well it really depends on the type of phone. Some types of phones have two CPUs so its kind of like having two phones in one, this allows you to answer two calls from two different sims at the same time. Essentially you receive signals from both the numbers in your phone.

The second type of dual sim phones don’t have two CPUs so you can expect mixed results. These types of phones have some sort of call secretary software that will direct you incoming phone call to voice mail if you are buy on another call on the first sim. However if the phone does not have this type of software the caller will have to wait as your line will give him the busy signal. The latter types of cell phones however are considerably cheap.

Many people often ask if they can actually take two calls on one phone. The answer lies in the number of CPUs your phone has. If your phone has multiple CPUs then yes you can take two calls on one phone. However if it does not then you cant.

Selecting between sims on a dual sim phone is pretty easy and done via the phone’s menu. Much of what you can do on both the sims is accessible via the phone’s menu. When it comes to dual sim phones its really on a first come first serve basis so which ever caller manages to get though your line first gets to talk to you. Selecting a dual sim phone is really a personal preference based on whether or not you really want to use two services. Most people might not use more than one service while many people do.


13 thoughts on “How does dual SIM mobile work

  1. Well that was quite a useful information and it answered by queries.

    thank you for that info


  2. hi i would like to ask if you can put one sim in a dual sim phone and keep it that way and use ypur phone normally or do you have to have 2 topped up sims

    • Hi ishmeet,
      Many thanks for posting in…. I’ll try to answer your question, but first let me tell you different types of Dual SIM technology prevailing in market today.

      «Pseudo-Dual» – for convenience to use second SIM (as rule, it has «no major» slot for this) without both SIMs connected with owner’s mobile service providers (MSP).
      1. Dual Sim Shift»
      2. Dual Sim Standby» (DSS) – allows the device to switch from one network to the other when required
      3. Dual Sim Active» (DSA) – allows the device to be connected to both networks at the same time (it’s using transceiver).
      4. Dual talk» – possibility to talk with 2 callers from different MSPs at same time.
      Hope the above has given you a little insight of different types of Dual SIM.
      So as for your question yes you can put just one SIM on dual sim mobile and use it normally. There wont be any issue. In fact even if you put two SIM even then you can change setting of your mobile so that only one SIM is active at one time.

      Its totally your decision…
      So use as you want……….

      If you still have any questions then do write me… this I promise I’ll reply instantly

  3. i have just bought a samsung 222 ch@t dual sim but i can only get one sim [ vodaphone] to register on the the network. the other sim a T mobile will just not credit the top up or register

    • Well thomas,,,, samsung 222 chat dual I can only say that one of my friend also has got it and he is also facing the same issue, despite of the given fact from the company that both SIM remain active.

      — The above comment is just true to best of my knowledge however there may be way out.

  4. heyy i want to buy H200 Android phone in white but its a duel sim i live in dunoon,scotland and was wondering if it would work here on o2 and also if it needed to have 2 sim cards in it or i can just use one. can you please tell me the simplest answer please not good with thiss kinda things 😀

    • Hi lassie,
      Yes it will certainly work there. In fact it will work anywhere in world. Also if you have a dual sim mobile then you can use it with only one sim also. There is absolutely no problems in that. It absolutely ur choice.

      And as always let me know if u want to know anything on any aspect of mobile. Thanks for writing.

  5. i have a ques , in a dual sim phone if one sim is on a call then why does it hear that second one is switched off to another caller??

  6. is it possible to attend both calls , when two CPUs are available in that phone?

    If it is, how it works. Give a brief note of this.

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