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Originally Posted by GSM_student
hummmmm... Simple..Thanks
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Well, many national and international SIMs use USSD codes to trigger callback in roaming. The main difference is the format of the number to be called - international but may be preceded with 00 or + or possibly something else before the country code.
See here for examples for Manx SIMs:
http://www.sim4theworld.com/usefullinfo.asp