Which models of iPhone 5 are compatible with CDMA in India? Can I use my CDMA sim in iPhone 5 ? I am using TATA INDICOM CDMA sim.
No.

iPhones only have GSM SIM slots.

The CDMA iPhone 5 can only use CDMA on the carrier which sold the phone. Those phones also have a GSM nanoSIM slot for use around the world.