Got a problem with the 6100 Im using. Its on S/W Version 4.01. The problem is as soon as you customise your Caller Groups and change the ringtone from the default tone, the phone's lights will not come on when someone calls. It doesent matter if you reset the tone to the default one, as soon as you make that one change, it all goes wrong.
Does anyone know if there is a later version of the software which resolves this problem ?