Please Note: If you see mobile signal bars on the screen once you have turned it on and it has sufficient amount of battery then you are ready for the next step.
Troubleshooting
If you donβt see the mobile signal or see the exclamation mark on the screen, then you are either in a low reception area or SIM card is not inserted correctly.
To test, walk outside the house to see if signal appears before re-adjusting the SIM card.