problem after releasing a SPRINT HTC M8

good day, after my release OP6B700 SPRINT HTC ONE M8. With the method of universal sprint unlock procedure. will release the sim, but to make the calls, I can not finish it, the call continues until the other hanging. End Call icon if it works, but not end the call. any solution. note whether the calls ended before without any problem. thanks

Enviado desde mi SAMSUNG-SGH-I747 mediante Tapatalk