Oh yeah get a good screen protector because of the stylus.
The N900's proximity sensor, which is designed to lock the touch screen when the phone is against the user's ear to prevent accidental operation, locks the screen unintentionally in bright light (usually outdoors) when a call is placed or received. Nokia has acknowledged that it is a "hardware issue" and cannot be addressed. To unlock the screen in a phone call, a tactile unlock switch in the right side of the device can be used. This however will keep the touch screen active and accidental operation of the phone keys in a call may occur when device is used as a handset. This issue has been blamed on the application of screen protectors, however N900 users without screen protectors are also experiencing the problem.[93]