Go to setting-configuration settings- personal configuration settings-add new- web. Don't enter any data in any field & press back. Then press again add new-access point. Again don't enter data in any field & press back. Now select each of them & activate them as default. Come back to config settings-default config settings- personal- activate. Then select activate default in all apps. Then select prefered access point & select the one labelled as My access point.
Now the phone wont connect to internet using the gprs/edge
Source-Nokia Forums