@keneda Thanks for the reply. Yes, what I've done so far is remove both SIMs and the SDCard. Then reboot. Then insert one at a time in to slot 1. Then slot 2. Then swap them over. Then put everything back. Nothing heard from the Mobile ever again.
Also OpenStreetMap was showing my location..... can't find me anymore. It's been a couple of hours now. The location pin is showing on the status bar at the top however.
I have now done a full re-install using 0.8.9-beta and selecting the full wipe option. My network Mobile icon is now back. Both SIMS appear, and I suspect the GPS will work again (not yet tested).
I guess this means some configuration data was wiped (or now lives in a new place) during the OTA.
This was not a big deal for me as I only got UT install a couple of days ago.