This service from ICICI bank is available on Vodafone, Idea, MTNL, Reliance and Tata Docomo. Now banking services are not away from you and one can access this service without any GPRS connection.
One can access any kind of info ranging from bank account, credit card account, demat account and other services. One must check the operator charges which will be applicable as per the service provider services conditions. Hope it satisfies all those searching for ICICI bank account balance enquiry. Not to worry about safety as its mobile Banking (USSD) has an in-built USSD encryption that ensures safety by 'no store, just forward' facility for secured transactions.
Update as on 06 Sep 16
The number has changed and the new numbers have been mentioned in the comments below in the comments section.