Hi, I've got an iphone5 & I'm having issues with personal hotspot sharing. Often when I turn it on it says something alongs the lines of please contact three to set up tethering on your account... Sometime it works though. I'm on 'the one plan' which includes tethering.. so I don't understand. Also just had a replacement phone & still the same problem. I've tried all the obvious reset network settings & a restore etc. Anyone got any ideas? or encountered the same issues?