I'm in Argentina (GSM 900-1900), same problem. Tried different PPC versions / Radio Stack versions. Now it is:
ROM version A.30.09 ENG
ROM date: 01/01/04
Radio version: 6.24.00
Protocol version 324e4
(Hardware model PW10B1)
I hate going somewhere and when I get there check the green light just to see if it blinks and it doesn't! And when I turn on flight mode and then off, I get a strong signal. I can't have a phone like that! Why it doesn't check for signal automatically???
A solution would be to have a program turn on the PDA with the backlight off (to keep battery life) at predefined intervals, check the signal and if it is OK turn off the phone but if it is on No Signal "tap" on the signal icon, then on Turn On Flight mode, then repeat. That would be a quick and dirty solution. I would love to implement it but I don't have the resources (you can read programming knowledge) to do it.