The GSM timeout on "Connect request", then "CON_ACK" when the handset says it will respond to the call, and until it says "READY" and the call can start, is 10 seconds - or the network should detach and return a status "unreachable".
The N900 is dangerously close to these 10 seconds now. It is silly that when the phone is locked in "portrait" mode - no landscape to decide on, but I can see it mess around even in "landscape" and back.

Is it possible to drop all "Transition" when a call or anything else that needs to be responded to? Place everything in Portrait and then the applications that have the option to "rotate automatically".
At the moment, it is crazy - "sensor says it is L, but app says P, open keyboard says L, app says P, ... whooops I have to ring - this says L, and then we have to get rid of this screenlock set L oops - no P no L, display, remove it, now which way L or P?

Heck now the network has resigned and call disconnected.