Why does my phone say "Emergency Calls Only"? Follow
Don’t be alarmed if your phone’s display reads “emergency calls only,” as it can be due to several possible reasons, including poor signal or a network outage. It might also indicate that your bill is unpaid or overdue or that your SIM has been removed or deactivated (or that your phone is carrier locked and unable to read your SIM).
If it’s an emergency, most phones are required to allow through emergency numbers (like 911 in North America) regardless as to whether you have network access at the time.
Troubleshoot by restarting your phone, double checking your SIM card, or toggling airplane mode on and off. If these suggestions fail to remedy the issue, you’ll need to contact your mobile carrier.