One of the site is
Update [19-06-2013]: I noticed another site providing FREE Recharge its Laaptu. We can trust this site. It providing QUIZes, REFERALS for earning free recharge. A new feature Laaptu providing is it gives 2Rs. for each referal.
Update [8-1-2013]: I noticed that I couldn't get any recharge amount from Embeepay and mcent so I have removed it from the following list. The following sites are real and we can trust because I am earning free recharge from these sites.
Amulyam has many ways to get talktime in our wallet. They provides emails of advertisers that sends to us and each opening of the mail will get .25ps in the wallet. They provide 2-3 advertisement mails every day. When the wallet reaches Rs.10 you can make recharge. Another way for increase the earnings in the wallet is to play and create contest or quiz. Playing contest will give .25ps and creating contests make you to earn high. Create a quiz with 10 questions will get you Rs.5. For Approved questions will get 50ps per question.
Another way is to purchase air tickets and buying things it will offer you Rs. 500 instantly. Also you can refer friends and make money. Each referral will get you Rs. 1.
Embeepay is a Facebook Application it provides points and when we sign up it gives 100 points. 30 points will give you 10Rs top up and 150 points will give you 50Rs Recharge.300 points will give you 100Rs
ULtoo provides free sms and get talktime to your account by sending sms.
Click here to get Rs.2 on your wallet instantly in amulyam
Click here to get 100points on Embeepay instantly
Click here to get Rs.2 on your wallet of ULtoo
Click here to get Rs.1 on your wallet of Way2sms
I hope this article will help you better.