Reliance offer two types of mobile operating system(1) CDMA(2)GSM
I purchased three instrument with reliance operating system which was supplied by reliance, before couple of years when it was first introduced in market, instrument was made by LG with reliance logo cost was around Rs.10000/- per piece required no sim card and no need of time adjusting even if you remove battery time adjust automaticly and that was new. After that reliance also introduced mobile with GSM system which is mostly offered by other mobile operator.
Regarding reliance net work it is very good, reliance has covered through out the country with optical fibre cable.
Reliance offers variety of services such as 2G, 3G, broad band, data dongle, all is working very well and I recommend to try Reliance mobile operator once. B