Postpaid Plans:Useful only for heavy users, being net savvy is a USP. Best for corporate people. The problem is that the benefits are way less compared to prepaid.Prepaid Plans:Works for anybody. Now with lifetime plans (donno why they call them that way now), u just recharge the amount u need. no hassles. The benefits are huge as u can get any new service for cheaper rates be it sms packs, 2G/3G internet, local mins/STD mins/ISD mins.I use a prepaid and a postpaid account. Postpaid account is used just for voice calling (I save atleast 1000 rupees with this plan), prepaid for other services! If I have to chose one, I will take prepaid anytime.I did have Auto debit/ credit limit/bill inflation issues with postpaid even when I never defaulted a single payment all through 6-7 years