Lock/Unlock GPRS when I want to

[SoundMan_EEPC]

I have had my new Samsung Omnia SGH-i900 for about a month on an O2 contract which gives me 100 minutes per month and unlimited texts. I am a light user so event this is more than I'm ever likely to use.

ONE ISSUE - GPRS usagea on my contract is GBP 0.98 per day. I have Wi Fi access at home - when I'm browsing the Internet from Home I expect the device to use my WiFi connection - sometimes even with a strong WiFi connection the browser starts up the GPRS service to access the Internet - at which point I end up with an unwanted GPRS charge on my account.

The only way I know for sure to stop the use of GPRS is to switch off the phone!

Is there a Regstry Fix, small applicaiton etc I can use?

This one issue aside I'm really pleased with my new phone/PDA.