For new readers:
what phones are affected,
See previous posts. (Mine are Samsung but if you Google you will see that) T and O 'Network time' seem to affect most makes inc Nokia.
what settings are used,
On my Samsungs 'Date and Time'/'Automatic'/'Use network provided values.'
what 'network time' is
Obviously either non-existent or wrong - otherwise I assume some backbone signal for the network functions.
how it differs from any other automatic time set and anything else that's relevant.
Lost me there!