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What is the main difference between GSM & CDMA?
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Answer Posted / engr allah rakha bizenjo
CDMA and GSM are Radio technologies and mobile Phone is
just an Antenna to recieve these Radio Signals. Since both
the technologies work on different frequency range and has
different modulation shemes therfore the mobile phones for
both are different.
Apart from this 3G tehchnology which is combination of both
GSM and CDMA (WCDMA) is compatible with both GSM and CDMA.
So a 3G mobile can serve for both GSM and CDMA radio
signals.
SIM (Subcriber Idendity Module) is consists of Credential
for network authorization. Since Both GSM and CDMA
technologies has different Authorization functions and
parameters hence both SIMs are different.
Note: In CDMA technology SIM is often called as RUIM
(Removable User Idendity Module)
CDMA uses Different Frequencies than GSM. CDMA also does
not require a SIM card.
Now some companies do provide SIM cards for CDMA
connections also, such as Reliance communications and TATA
Indicomm in India.
CDMA can hold more calls per channel on their towers, while
GSM drops alot of calls. That is why people are always
complaining about T-Mobile and At&t dropped calls. GSM is
used internationally while CDMA is mostly used in the
domestic United States.
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