Paytm.com is very very nice website.i am always use it for mobile recharge or dth recharge. Easily use very simple feature.
If you want mobile recharge just download paytm from google play store. Open play store and type paytm in search bar then enter. After download open it. Login paytm. In home screen show mobile recharge option. Type mobile number then select operator, cercle, and amount then click pay option.