tata cdma iPhone 5 model no a1429
In the settings app, get the MEID and have your cellular carrier provision for that number. 

CDMA isn't something you can self enroll unless your carrier lets you enter that information into a web portal or other self-service kiosk.

In the US, CDMA carriers still put in a SIM which carries an IMEI for the appropriate carrier, but I don't recall ever having them request that number. 

In short, contact your local carrier for assistance.