Method 1: Remove Battery and SIM Card
Step 1: Power off your Android smartphone and remove both battery and SIM card. Step 2: Wait for about 5 minutes and then insert SIM and battery. Step 3: Switch of the device. Now you network error issue will be solved.
Most of phone’s battery now cannot be removed from phone. I thought it is more durable than traditional phone but I was wrong. Anyway, my statement has nothing to do with the sim card. Good to know my sim was working fine yesterday when I connected it to the internet.