1) Is this true
From my understanding there are really 2 types of cell networks in uses GSM and CDMA based ones. GSM is mostly used everywhere and CDMA mostly just US , Canada and a few others.
Or am I wrong and there are many others
2) Most GSM phones have a GSM sim card that if the phone is unlocked can beable
to use the phone on any GSM based providers network.
Does CDMA based phones work the same way i.e CDMA sim card that if the phone is unlocked can provide the phone with the options of being able to be used on any CDMA based providers network. Or does CDMA not uses sim cards and uses another mechanism to store phone data and authentication stuff ?
(note I am only talking about smart phones obviously there is trac phones , pay as you go phones , and other non-based smart phones that are fixed when bought i,e there is no sim and they are usually throw away cheap phones that are specially made for one network are very restrictive and really cann't be changed without recreating the phone from scratch almost)
3)
Is gsm sim cards physically different then cdma sim cards (if these exist) or can one uses gsm in a cdma phone and visa versa provided the phone is unlocked?
Obviously if the phone doesn't support the frequency band , authentication protocal or the modulation/demodulation scheme then NO. But do mostly all smartphones have the capabilities to modulate/demodulate gsm or cdma based signs. (i.e all possible cell signals and it is just in the sim card or authentication protocal that must be tweaked )
From my understanding there are really 2 types of cell networks in uses GSM and CDMA based ones. GSM is mostly used everywhere and CDMA mostly just US , Canada and a few others.
Or am I wrong and there are many others
2) Most GSM phones have a GSM sim card that if the phone is unlocked can beable
to use the phone on any GSM based providers network.
Does CDMA based phones work the same way i.e CDMA sim card that if the phone is unlocked can provide the phone with the options of being able to be used on any CDMA based providers network. Or does CDMA not uses sim cards and uses another mechanism to store phone data and authentication stuff ?
(note I am only talking about smart phones obviously there is trac phones , pay as you go phones , and other non-based smart phones that are fixed when bought i,e there is no sim and they are usually throw away cheap phones that are specially made for one network are very restrictive and really cann't be changed without recreating the phone from scratch almost)
3)
Is gsm sim cards physically different then cdma sim cards (if these exist) or can one uses gsm in a cdma phone and visa versa provided the phone is unlocked?
Obviously if the phone doesn't support the frequency band , authentication protocal or the modulation/demodulation scheme then NO. But do mostly all smartphones have the capabilities to modulate/demodulate gsm or cdma based signs. (i.e all possible cell signals and it is just in the sim card or authentication protocal that must be tweaked )