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Do you have the roaming option unticked in mobile networks? Menu>settings>wireless and networks>mobile networks...
mine is unchecked too.
i hope i dont need to do a hard reset, but this has been the case since day 1, before any apps were installed.
although i think we may have 2 distinct issues, since mine only occurs when im close to roaming territory, but not in it. The same sim card when used in an iPhone does not go into roaming.
is this the case with you ?