1) GSM (Global System for Mobile Communication) Mobiles which you can use for Mobile operators like Hutch /Airtel Frequency of operation is 900/1800 Mhz
2) CDMA (Code division multiple access Mobiles) which you can use in TATA/RELIANCE
3) WCDMA (Wide Band CDMA mobile) which you can use for 3G operators presently none in India.
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