Your phone says "Emergency Calls Only" because it's not connecting to your network. It could be due to a SIM issue, no active plan, or being in a poor coverage area. Try restarting your phone or checking the SIM card.
This normally occurs when there are problems with the SIM card, and when the network is locked, or the problem is with billing. You may want to turn off and on airplane mode, retry with a SIM card, or call your device carrier.
