I had the same problem. In the end I restored my phone to factory settings but now it's just stuck looping so I wouldn't bother doing that unless you reallyyyy want to. Others are saying wait a few hours.

I didn't even know IOS9 came out today.. I literally haven't updated my phone in over a year, it was on IOS7 and I just picked today to do it out of the air.. Terrible timing!!

My 5s is doing the same thing. I now can't use it at all. any progress yet?

Nothing for me, I'm going to bed and I will try again in the morning and factory restore again if necessary.

I have enjoyed not being connected to my phone for one night, even if it was initially filled with panic!! Hoping it won't be too many more though!

Same thing. Restored already, resetted, everything. Doesnt work.

I wish I were able to restore.... it wants me to turn off find my iphone first - which of course I cannot.

switch it off, connect to itunes and press the home buttom at the same time. it will start in recovery mode (or something like that) allowing to restore. But it didn't make any difference.

Still absolutely nothing. Apple need to sort this ASAP. Not acceptable to be honest

power and home = hard reset.  I have done that several times....  can't get past it can't restore due to Locate my iPhone.

It's not power and home. Is hold switch on by holding home and plugged into itunes. It shows a screen with a thunderbolt cable and iTunes Icon.

Then it will say your phone has a problem and should restore or update. Otherwise you will keep with that Locate message.

Mine is having the same issue can't accept calls.  NOTHING....I've tried rebooting and connecting to ITunes.  Same issue grrrr...

Yep, stuck on that too.. Shhhhhh

Same problem.  Tried recovery mode with iTunes, would not allow restore settings or restore from backup.  It indicates Find My iPhone setting is still "on."  Tried to erase the phone via iCloud but would not work because the phone needed to connect to a network which it never does.  Hard resets not working either.

Guys, this thread has more replies already: Ios9 stuck on slide to upgrade