At this point in time all of bugs haven't been fullly worked out of the AKU 3.5 ROMs. So look at one of the AKU 3.3 ones. Colonel's is pretty polished at this point.
But I think the most stable is probably wideawake's AKU 2.2 ROM.
The ring-thru problem is only an issue with the Apache on EV-DO networks and was fixed by PRI 1.18_003 and 1.19_003. If you look in settings->device information you will see the current PRI version. As long as its one of those it is fixed--and none of that has anything to do with the CE ROM at all.
No unlocking necessary.
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