The 3G coverage around my home is weak (no bar, 1 bar, 2 bars = highly
exceptional).

As far as I know there's no reason to connect to the 3G network when
the phone is on WiFi, but yet when WiFi is enabled and working my
phone will connect to the 3G network (not establishing a data
connection, but just connecting to the network). When I get a call and
move around a little the phone will drop from 3G to G (because of the
bad reception, I assume), but when that happens the call will be
dropped.

My suggestion:
- if WCDMA preferred = enabled, still ignore WCDMA during WiFi (if G
signal = stronger than 3G, which should be the case most of the time).
- somehow make sure that the G network is able to take over the call
over the 3G network without losing it.

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