27 Jan
2010
27 Jan
'10
5:58 p.m.
David, On Wed, Jan 27, 2010 at 20:50, David A. Burgess <dburgess@jcis.net> wrote:
Remember also that USSD applications live in the SIM's home network, not in the local carrier's network. If a carrier uses USSD for account management, the USSD features should work the same way anywhere in the world.
Not exactly. There is a range of numbers which should be forwarded to your HPLMN, while others are to be processed by your roaming operator. IIRC, all 1xx should be forwarded to HPLMN. That's why it is used for balance checking, etc. -- Regards, Alexander Chemeris.