This is one of the best site and application for instant recharge of our any operators. I do instant recharges on freecharge.
I also got offer of cashback on first recharge. I had lost my coupon mail when I recharged. But after calling the customer care they sent me another mail of the coupons which I used for other shopping.
Freecharge has also tied up with Snapdeal to make online experience easier. Whatever coupons we get after recharge and bill payments, we can use it on snapdeal also.