Can't switch iMessages on I can't switch iMessages ON anymore (it was ON).
When I try to flip the switch from OFF to ON it instantly returns to OFF (I don't see any message like "activating...", it just doens't flip). So I don't think it's a server problem because the iPhone isn't even trying to connect. It's like te switch is broken.

I try'ed/checked


restart
hard reset
resetting the iPhone settings
changing Wifi network and switching to mobile internet
there are no restrictions (they are off)
Facetime works (I can turn it on/off)
Date &amp; time are correct
I can send iMessages via Messages on my iMac
Googling
Plain SMS messages work fine
I can log in and out on my iCloud account


I did make a change to my AppleID. Move my mobile number from "home number" to "mobile number" (http://snag.gy/ze6Ip.jpg) because iMessages didn't work with my mobile number anymore. I tried reverting this changed without succes.

Anyone has an idea how I can fix this?
I created a new (iCloud) backup, wiped the phone and restored my backup.
Not really a decent solution, but iMessages works again and I didn't lose anything.