I have No Ghost Call - Tested > 500 calls.
I do not know if this post useful or not but I was very interesting to do the test myself.
My O3D running stock rom GB 2.3.5
Build Number GRJ90
Firmware V21a Nov-15-2011
I bought this phone about 2 weeks ago from ELGIGANTEN store, Kungsgatan, Stockholm.
I did upgrade to GB using LG mobile support tools.
Rooted using Super One Click 2.3.3
Installed CWM from ROM Manager
I used system tuner to disabled start-up for many apps. I keep only the important apps.
I manage to have free RAM > 220 MB.
I did call test for 3 days (24-26 April) from my O2X and Galaxy Tab 7.7 to my O3D.
O3D Battery Level > 90%
Day 1#: ~75 calls in 2G, ~75 calls in 3G
Day 2#: ~100 calls in 2G, ~100 calls in 3G
Day 3#: ~100 calls in 2G, ~100 calls in 3G
My O2X roam in Telia. Numbers from Indonesia (Operator Telkomsel)
My Galaxy TAB 7.7, Telia Sweden Number.
My O3D, Telia Sweden Number.
And the result was good. I never have a ghost call. All the calls successful and my O3D always ringing.
I may do more tests with different condition.
1. Test when RAM < 100 MB and Battery > 90%
2. Test when RAM < 100 MB and Battery < 15%
If some of you know how I can reach the free RAM < 100 MB, please let me know. I tried to start many apps but the free RAM still around 150-180 MB.