hello , thanks Nacor79 for answer , but all ZTE geek has problems using Iranian Sim card , this isn't only my problem and all other ZTE Geek in Iranian people using this phone , also we had same problem using Lenevo K900 because both CPU is intel z2580 , we can solve Lenovo k900 problem using wifix software after rooting phone but in ZTE geek wifix and same software can not solve the problem , also I changed phone Rom to several version but problem didn't solved , please help me if any one know what is problem ,