The “Emergency calls only” and/or “No service” issues are one of the more common issues that Android users often face. This problem is network-based and inhibits the user from being able to successfully use any network-based functionalities of an Android device, and not being able to use a Smartphone to make calls, send texts and connect to mobile data networks certainly is a major letdown.
While this issue is most commonly found to affect Samsung Galaxy Smartphones, it does not shy away from all the other makes and models of Smartphones out there. An Android device can be forced to display an “Emergency calls only” or “No service” error by one of three things – poor signal strength, some kink or problem in the device’s software, or faulty hardware.
As long as the cause of this issue is not faulty hardware such as a defective SIM card or flawed SIM card reading equipment in the device.
After Writing Certs or upgarding your samsung phone you might experience no service or emergency calls only.
Steps to Fix Emergency calls only on N920P N915P G925P G920P G928P and others.
first dial *#0011# and make sure “Imei Cert” shows Pass
then dial this code ##72786#
click on yes
phone will reboot
congratution you should have a working network now.
NOTE: If the above method did not solve your problem use the comment box and we will be glad to assist you.