Type:
*#0000#
And here’s what it means:

Find more freaky codes (almost all of which are unverified, so use at your own risk) here.

When Nokia said N95 was a “multimedia computer,” they apparently meant that it has the battery life of your average laptop. I’ve been able to make mine last 2 or more days if I’m not using it much, but if you’re getting the most out of your phone, you can pretty much bet on recharging [...]