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sim cards not used in CDMA phones

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  • #36883 Reply
    Nishad.M
    Guest

    hi

    why sim cards are not used in CDMA phones,and like to know the PN sequence comes in simplified manner,can any one one give me a valuable reply

    #36884 Reply
    Pankaj
    Guest

    Why?? there is no technical reason of not having the SIM from the very begining and now because of the absence of the proper standards indutry didn’t spend in teh SIM. In fact now the CDMA is also moving towards the SIM cards and in that world these are called R-UIM (Removable User identity Module). There are two standards that define this IS-808 and IS-820. China Unicomm has deployed their own propritary solution (very close to IS808) and now the industry trend is to use that solution.

    To answer your “why”, USA had been using Analog technology for mobile communication. Since CDMA was invented in US and the primary mkt for CDMA was US, evry one worked with an evolution plan from Analog to CDMA. The Analog phones do not have the SIM and when CDMA started, the phone naturally were supporting Analog and CDMA and hence no one felt the need SIM card. Europe is all GSM and hence they never looked into these things. It is only in Asia that they look into both technologies, deploy both technologies and hence tend to comapre and then try to pickup some good parts from the other technology.

    #36885 Reply
    prabhakar verma
    Guest

    Pankaj that was the right answer…
    I truely agree with you..

    #36886 Reply
    Nishad M
    Guest

    hi Mr. Pankaj,

    I really appriciate your attitude to answer my query. Please give me your email address.

    Regards,
    Nishad

    #36887 Reply
    Nishad.M
    Guest

    Hello,

    Is it possible to use GSM and CDMA in a single instrument,if its possible please tell me how is it…expecting ur reply

    regards

    #36888 Reply
    Pankaj
    Guest

    Slight correction. China Unicom is close to IS-820 (not IS-808 as i stated earlier).

    #36889 Reply
    Pankaj
    Guest

    As per my knowledge, some handset manufactureres are coming up with these type of handsets. However this is still in priliminary stage and i do not know of any commercial offerings.

    agarwalpankaj@hotmail.com

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