Well I came to Chennai from Delhi and took a RPG prepaid mobile connection. I had an idea connection earlier. I never imagined one of the largest cellular services providers in chennai will be plagued by such problems
Disadvantage
1) Primitive, Cumbersome, Customer unfriendly Method of Balance Enquiry and Recharging your coupon.
2) No Roaming in even a important city like mumbai.
3) One has to submit an application for getting roaming activated on Postpaid connection
4) Signal is weak inside the buildings. most of the time my friends or myself get as network not vailable
5) while talking shaky connections loss of voice
6) Delay in bothways SMS transmission .
Advantages
I can’t think of any