How to Unlock IOS 9.1 with Gevey Sim
First, you need to disconnect icloud account, disconnect itunes account, disable mobile data
Now you put in your (3at) simcard, in my example it is a Iphone 4s with 3AT simlock. And I tried Eplus, Telekom etc.
Put it off again, disable wlan and put in the gevey adapter + your new simcard
Now it could activate successfully. If not try again and again.
If everything is fine and its working with your mobile provider you can switch on everything again. WLAN, mobile data.