Iphone 5 / ios 8.1 / RSIM 10 problem…


I tried a code but I made a mistake, I insert the code for my new operator. the problem is that I do not have the window that appears and tell me the code, I have always ‘unavailable network’ … I tried to removed the sim card or switch off the phone but I still have the same problem . how to reset the sim card to see appear again of the operator selection of window??

Thank you for your help