iZone Telecom provides Defne’s USSD Roamer Callback which is an innovative roaming solution that allows mobile subscribers to enjoy callback service by sending USSD request or SMS while abroad at low rates.


Typically prepaid subscribers cannot make phone calls while roaming in other networks because of difficulties in real time charging if Camel agreement is not available. The solution enables roamers to make calls to any destination. Moreover, Postpaid customers can enjoy better rates abroad when they call parties on their home network with this service.

USSD Roamer Callback