Welcome to the forums.!
If your running on the latest firmware for the
N95-2, you will have auto screen rotation (ASR), but you have to switch it on, and sliding the front of the phone to reveal the music keys no longer automatically switches to landscape mode with the latest software.
To Use ASR, you need to make sure you have the phone up right too, not flat on the table etc.
To switch ASR on...
Menu > Tools > Settings > General > Personalisation> Display >Rotate Screen >ON