Yep, it's FUBAR ..but if you're exceptionally fortunate you just might be able to receive incoming calls. Actually, in one of the (very) few times I was able to get to *snort.scoff.sneer* "sort me out centre", I heard the pre-recorded message about some network upgrade nonsense; sadly, I got to hear this while driving AND looking for a building so I wasn't able to apply sufficient attention to really get it clearly.
Still, you too can get endless hours of entertainment trying to get through to 123 to find out what's happening!