Guys it's not the network - mine didn't work for a full day- while my wife's worked just fine.
It's softwAre - its a bit buggy.
Here's what I did to get it to work- after all the resetting and rebooting of the networks didn't resolve my issues
Sorry - in typing on my iPhone - since wife is asleep I won't dictate w Siri.
So I ve tried everything here - turning off Siri / reset network / nothing worked. But my wife's works just fine.
And I don't that it's server issues - because my didn't work for 1 full day I kept trying the reset, no luck.
So today I thought about at what point did it stop working ?
It was after doing an update All (app store) - and I had 59 aPps there were not up to date.
I restored from a backup from iTunes of my old iPhone 4 when I got my iPhone 4s, so lots of apps !
I checked for memory - I had 10 gb free so it wasn't that !
Then I made sure iCloud has my data backed uP- check in settings ICloud > backups
So then I did a full reset under setting - this will erase everything and restore from back up - took about 12 mins - not too bad at all !
And after it restore it started downloading all the apps - while It was doing that Siri works fine - I deleted google voice and google app before the downlOads could finish just because I thought those apps might be conflicting as google app had the same raise to ear to speak option.
Any how it works And I'm happy now!
Also I got a MSG stating not all apps could be restore as some no longer exists on the app store ( maybe those were messig with Siri? Who knows , all I know it Siri is back in my life - and She remembers me And my relationships ( who my wife is , etc. but that iClound + contacts .
Good luck , all.
This should be the LAST resort if you are desperate for Siri.