I have the Nokia N73 and it is ok, but not brilliant. The main reason I keep it is because it has Tom Tom installed and when used with a GPS receiver I can use it in the van as a Sat Nav.
A few days ago the phone was working really slowly and I was travelling to Blackpool and was using the phone as a sat nav. The battery had two bars remaining and so I switched on the charge function on my hands free kit, but it did not work and so the battery was completely drained. When I recharged it the phone was even slower and if I tried to open a message it took 10 minutes and then another 10 minutes to reply

I was ready for sending it back to the shop as it was still under guarantee, but before I did I thought I would try and reinstall the software.
MAKE SURE YOUR BATTERY IS FULLY CHARGED BEFORE DOING ANY OF THIS.
To reinstall the software you will need a USB cable, this normally comes free with the phone. Make a backup of everything on your phone using Nokia PC suite- http://www.nokia.co.uk/A4630250
Then install and run Nokia software updater- http://www.nokia.co.uk/A4226014
This will check your phone to see if you have the latest version installed. I already had the latest version installed and so I chose to overwrite it anyway.
The phone restarted, and then I had to restart the computer ans the usb cable could not detect the phone. After restarting I reinstalled the backup which was made earlier using Nokia PC suite and the phone is working fine again now
