i've used micro sim card 3g/2g flat rate , 1 same operator make calls. i'm under wp 10 , updated. for me, both sim cards have stopped. in cellular menu +sim, cannot find sim cards. indeed, displayed in grey sim 1 setting , sim card one, , same sim 2. i cant put phone in plane mode, , have restart device. works fine time , and restarts again. ive changed internet sim card, problem persists. ive permuted sim cards,,, same. what must ? change device ? sim cards ? or other thing hi, seems issue phone software tried changing sim card, same issue. better assist phone issues, please answer following questions: have tried inserting sim card in phone isolate issue? did change or update in phone settings before issue happened? how did restart phone? regards. Mobile Devices / Microsoft Lumia and Nokia Lumia /