I installed GPRS upgrade on my Treo 180 and it works. But - phone searches for network allways after 30min to 1h and write NO SERVICE in operator line LV LMT GSM. I can make calls, but no body can call to me - they hear busy signal and can't call me all yesterday. When I see it, I push power button and restart wireless mode and now I can work normally for next little time... Has somebody any ideas?