In free mobile service app you can easily service your phone by using different important USSD CODES of India. All the USSD codes for Balance Check 2G Internet Balance 3G Internet Balance Recharge Know Your Number Do Not Disturb Service SMS Packs Net Packs Special Packs Customer Care Number Activate Internet Deactivate Internet Activate or Deactivate any Service Caller Tunes Free Internet Free Minutes Full Talk Time Mobile Internet Balance Transfer Night Plan Local SMS National SMS ISD Packs Rate Cutter Last Call Charges Service Menu Daily Weekly Plans Complaint Number Direct Customer Care Call GPRS Settings Caller Tones Voucher Recharge VAS Balance Miss Call Alert E-Recharge Tariff Plans STD plans Landline plans.