Please Pay attention to AVA Service Details:
There is no expiration for your credit.
There is no hidden fee, no connection fee, no extra fee.
There is 1-minute rounding.
Rates to call Tehran, other cities and Mobile are 7.9, 9.9 and 11.9 Cent/Min for the very first 20 minutes.
There is 10% discount for the second 20 minutes.
Rates to call Tehran, other cities and Mobile are 3.5, 4.5 and 5.5 Cent/Min After the second 20 minutes till end the call.
More you talk, Cheaper rate you get.