Explained it all to the nice people at Orange and today had my replacement handset delivered.
My new phone is scratch, dust and dint free: however, the phone just doesn't seem to connect to the network anywhere near as quickly or as reliably as my original handset. Most of the time it sits there with the warning exclamation - suggesting there is no signal - then it'll suddenly connect and I'll have three or more bars. That only lasts for a few seconds generally though: then it's back to the warning exclamation again.
Here's my phone details:
...note the exclamation - as it sits on my desk, it changes from no bars to four and back to none again: maintaining signal for no more than a minute at best.
This is the default ROM shipped with the phone from Orange: I've tried a couple of hard-resets and tested with no 'new' software installed to the phone - but to no avail. Anyone have any ideas? I don't really want to put a custom ROM on this at the moment but is there a radio update which might work better - but that can be installed without reflashing the phone?