I was given the task of wiping clean of all contents on my boss blackberry 8310 before handing it to another employee. Of course I’m so stubborn and refuses to look it up in the manual on how to do it but I finally managed to wipe the blackberry clean with some trial and error. Here’s how you do it;
1. go to settings-options-security options-general settings
2. scroll all the way down to Services and it should say *** no services ***
3. click and you should see the option to Wipe Handheld-click and watch it do its thing.
4. note: do not pull the battery out! be patient and wait! after it does its thing it will be a clean slate.
good luck!