You get paid starting from the very first action of yours Registration, other activities which pay you are E-Mail verification, Successful Referrals by Email/sms, Every time you send any sms.
So the more you send, the more earnings will go in your wallet. The amount earned by the user can be redeemed in the form of Mobile Recharge.

PriceKart: Latest website which pays free mobile recharge by referring and doing some other tasks. Register and confirm mobile no.You will get 5 points, Refer one friend you will get 5 points.

PICKZUP: Here you will get recharge as well as you can apply for check. Joining bonus Rs.3 and you will get Rs.3 for per referrals who joins under you. Minimum mobile recharge rs.10 and minimum check payment Rs.500.

160By2 :Old website but just started to give free Mobile Recharge to its users by playing quiz, puzzles & Referring others. Enjoy smsing and earn free recharge by enjoying some puzzles and quiz. Get Rs.2 as a joining bonus.

ZipTT :New and cute website. They are paying for playing quiz and referring others. Minimum Recharge Rs.10

LAAPTU :Earn recharge by playing fun quiz and Math quiz, so its better chance to improve your math and get free recharge also. You can recharge your mobile after your balance reached Rs.2. Invite others and get Rs.1 as a referral fees.

ULTOO :First website which started this funda of free recharge by playing quiz and puzzle. Here you will get 2 paise for sending 1 sms too. Get Joining bonus Rs.2 and Rs.1 for per referral, minimum recharge amount Rs.10.

LYFETABS :Join and Earn 50 Points as a bonus. 100 Point is equivalent to Rs.1. Reffer your friends and get 100 points for per referrals who joins under you. You can enjoy this website as a social networking website also because it got some features of make friends also.

WAY2SMS :One of the oldest website for sending free sms. You can send international sms also from this website, but you can earn recharge by playing quiz and referring others only. Minimum recharge is Rs.10 and daily you can redeem only Rs.10.

PAISALIVE :First India genuine website which pays for clicking on advertisements . Get Rs.2 for per referral who joins under you. Minimum payout Rs.500 through check.

CLIXSENSE :Another trusted website  for online earning. Here you will get money for  clicking on advertisements and referring others. Minimum payout 8$ via paypal.