Is your balance zero? Don’t be afraid of missing an important call: all users of the pre-paid service system are entitled to a “live” zero balance!
Even if your balance is zero, you can receive incoming calls from any number, receive SMS, use the caller ID function, call waiting function, and make calls to SIM SIM Support Services.
You don't have to do anything special: this option is always available whenever you are in your domestic network.
Do not switch off your mobile phone, and your friends will always reach you!