This is the reason why many Verizon devices may have a non-working MMS or voice calling functionality if used in non-Verizon network. It is for this reason as well that it’s impossible to use a CDMA phone on different CDMA network.Īlso, even if a CDMA phone has been unlocked, there’s a chance that it may not work properly or at all in another network. CDMA devices is not so easily modified since subscriber’s information are coded deep within the system. When it comes to convenience in switching networks, GSM devices has the edge since a user only needs to get a new activated SIM and insert it on the device. While GSM uses the information stored in a SIM card in order to work, CDMA, on the other hand, keeps the same type of information within the device itself. GSM is the more popular and comprises about 90% of the global market share today. Code Division Multiple Access comprises a relatively smaller market in today’s mobile market. Both technologies have a significant gap between them and it’s borderline impossible for an end user to bridge them. If your own carrier uses GSM technology and you are unable to your device in another GSM network, that’s probably because it is GSM locked. Some carriers sell factory unlocked devices so as long as you are in a compatible network, you can insert a SIM card to it and it should work. If you put a SIM card from another network, a locked device will not be able to access the information in the SIM card, or may not be able to register to that particular network. This means that if you buy your phone from your carrier, it’s most likely locked and you won’t be unable to use it with another network. In order to do this, they use a software code to lock their devices. Carriers don’t want their subscribers to switch to other networks as much as possible.
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