Review: Nokia 7510
Bluetooth
The 7510's Bluetooth worked flawlessly. It paired with two different headsets, another phone, a Windows PC and an Apple PC with no problems. Passing files, such as pictures, back and forth was not an issue. Sound quality in mono and stereo headsets left a little to be desired. Since call quality with the 7510 wasn't great to start with, Bluetooth just made it worse. There was a loud hiss present that I was never able to clear up. The hiss didn't mask people's voices, but it sure was annoying.
Clock
The 7510 has a hidden exterior display that lights up when you have incoming calls, new text messages and so on. It also is where you can view the time if you so wish. Simply press the volume toggle on the side of the phone, and the display springs to life and will show a nice, large clock. The only problem is, it is very difficult to read when in direct sunlight.