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andy · 18-02-2010, 08:05

It seems they are probably talking about a choice between USSD and SMS triggering of callback, which is an issue that actually affects all global SIMs, some using one or the other or both, and may vary for visiting different countries or networks, often without the customers knowing which is in use.

	(#8)
andy (Offline) Senior Member Prepaid Prophet Posts: 2,128 Join Date: 10 Dec 2004 Country:	18-02-2010, 08:05 It seems they are probably talking about a choice between USSD and SMS triggering of callback, which is an issue that actually affects all global SIMs, some using one or the other or both, and may vary for visiting different countries or networks, often without the customers knowing which is in use.