Recently had a case of a user having roaming GPRS problem in a neighbouring country. His Windows Mobile 5 (WM5) device keeps giving modem errors. Normally we would just write it up as a typical roaming issue.
But this guy is stuck in one place for a week with no Internet access. Oh did I mention he is also a VVIP user? So tried to check all the usual Activesync and GPRS settings. No joy.
In the end, have to ask the user to call Singtel. Singtel told the in-country telco to do something about their GPRS. Voila, now connected.
The moral of the story is, when having roaming problems, call your Singapore telco pronto and lean on them. After all, you are paying for it!