If you are a client of ICICI bank , than you have an option to recharge your mobile by sending a sms from your registered mobile. Have a look at below screenshot.
SMS MTOPUP(space)10-Digit Mobile Number(space)Operator name(space)Amount(space)Last 6 digit of bank account number to 9222208888 Eg: MTOPUP 9876543210 MTNL 100 123456 to 9222208888.
This is a good initiative by ICICI bank as now one does not require a computer or an access to wifi as now one can recharge mobile with one simple sms. Besides that with ICICI Bank's SMS Banking you can also check your account balance or can request for a mini statement etc..