There are Samsung Omnia users facing problems with Wifi connection and GPRS connectivity and even some phones not responding. The following steps can do the trick:
1) If Samsung Omnia is not responding and the phone not awaking then the best option is to hard reset your phone.
2) If the GPS is not showing the correct locations then better download GPS Gateway 2.0.
3) If GPRS connection is automatically trying to connect whenever the WiFi connection goes down then go to your settings and change automatic GPRS settings.
4) If the WiFi just wont come on then go to settings, system, power, then wi – fi and there is a box checked for power saving uncheck that option.