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There are basically 2 branches when it comes to mobile phones. Some phones have SIM cards to connect or another technology that does NOT use sim cards These non-sim phones use CDMA instead of SIMs, so you cannot just swap SIMs like on GSM.
This is GSM and is what T-Mobile and AT&T use for voice.
Sprint and Verizon use CDMA but isn't normally unlocked.
hi
telecom sims work on two different technologies called 1)cdma
2)gsm
both has there own pros and cons. but it is not possible to convert a cdma sim into gsm one . ypu can maximum get a dual sim card enabled ph which supports both type of technology.
Is the TATA Indicom sim a GSM connection..?
Is that the Huawei C5330 supports GSM...?
Keep in mind that u cannot use a CDMA sim card on a GSM phone. Or a GSM sim will not work on a CDMA phone. Just go by this.
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