“Please Call Me” Service lets you talk to your friends even when you have no more airtime or your line has been soft-suspended. All you need to do is send a free, blank message to the number you wish to call you back.
Both prepaid and postpaid subscribers can use this service.
: Since “Please Call Me” is only provided by MTN Irancell inside Iran, using it to ask the subscribers of other operators to call you back is not possible for now.
How to use “Please Call Me” service:
Dial *150*your recipients’ number#