Phone will not ring
I have experimented a while trying to see if anything might stop the problem. Powering off and on does not affect it. Changing ringtone does not affect it. However, two things I noticed did seem to work.
1 - Set the wireless network ON i.e. Edge OFF - phone seems to work OK
2 - Do a Network Reset from the Settings section.
Will keep testing and report back.
Sony, Windows XP