To check the phones Software revision for Nokia Mobile. On the main screen type *#0000# To enter in the secret menu in Nokia Phone. On the mai

Change closed caller group (settings >security settings>user groups) to 00000 and your phone will sound the message tone when you are near a radar speed trap.
Setting it to 500 will cause your phone 2 set off security alarms at shop exits.
Try this secret trick if you can handle the unexpected.
Note: This secret trick wont work with all phones Models.