From May, whenever your balance does not allow, you can send Call Me to request someone to make a phone call to you. Customers with balance below $ 0.10 are entitled to 10 Call Me. For each Call Me, it will be charged $ 0.02 and if its amount exceeds, the service is unavailable.
By doing a top up, the reset is done automatically to counter the free Call Me.
Dial 8888 + the destination number and press Call.