Tata docomo sim card not working in nokia 1100 3315 2300,2100 etc.

tata docomo india’s youngest fastest growing telecom operator have some issues with old handsets as of now tata docomo sim cards are not working in many old handsets . It’s very annoying but due to their advance technology this case happened .
If you want to docomo services than you have to buy a new gsm handset or replace your sim free from any Do Shoppe