got a lovely birthday gift from my wife but its not really usable without a sim 
if i want a prepaid - which operator has the best speeds in mumbai [eastern suburbs]? 
my default is airtel since the shop is close to home but that's obviously not a good criteria 
despite being a loyal rcom customer since 2003 i had to eliminate the gsm since 
they don't offer prepaid at all with any micro sim 
the cheapest postpaid plan starts at rs 750 monthly unlike airtel that starts at rs 100