I DO NOTHING AM NOT A DEVELOPER I USED THIS PHONE EVERY DAY ...BUT I DID SOMETHING WHEN IT SHOW NO SERVICE ONLY 911 AND IT THE PHONE INFO GONE ...I TRIED TO USE TESTING MODE AND PUT 000000 LIKE SERVICE NUMBER AND I FAILED TO ENTER PHONE TESTING MODE THEN I USED APPS WHICH IT DID THAT FOR ME I TURN RADIO OFF AND THEN ON RUN TEST AND NOTHING CHANGE SO I REMOVE THE APP AND RESET THE PHONE AND THIS TIME IT STUCK IN BOOTLOOP FOR EVER