What's up with my phone?

[Guest sherbs]

Whenever I turn my T-Mobile Vario on it vibrates and also sets the icon in the top bar to vibrate. I manually switch it back to ring. I go into messages, open a text message hit reply and the phone vibrates and sets itself to vibrate again. I manually switch it back to ring and switch it off. When I switch it on next, it reverts to vibrate.

Here's another weird thing - set the phone to off, switch off/on and it is on ring - switch off/on and it is on vibrate.

Hope I've explained this OK and that someone can tell me what's going on.

Thanks.