If “emergency calls only” is displayed, then it’s likely you have no signal. The reason you’re still able to make and receive calls is probably because you have Wi-Fi calling enabled.

Don't think I have WiFi calling. Just searched my settings for WiFi calling and it wasn't found. 

Puzzling.

What phone do you have?

Oppo A15

The Oppo A15 supports Wi-Fi calling, but the exact steps to enable it may vary depending on the carrier and device settings. According to a discussion on the O2 Community, users have found that Wi-Fi calling can be enabled by navigating to "Settings > Wi-Fi and Internet > SIM and Network" and then toggling the Wi-Fi calling option for the respective SIM slot.

Found that and it's set at on. So, that explains it! 

Thanks.

Just tried making a call with WiFi calling turned off, and it still worked.

Phone's doing what I need it to do.I was just curious why it was displaying emergency calls only. 

Thanks for your time and efforts.

Hi ​@Michael Duffy 

Definitely a strange one, a replacement SIM card could be worth a shot.

Thanks for the help here, ​@WelshPaul.

Tom

It's not really a problem, phone works perfectly despite the emergency calls only. I'm just wondering if there's other id mobile customers in the Glasgow area that are getting the same m message.

No problem ​@Michael Duffy, thank you for letting us know. Let us know if you need any further assistance.

Thanks,

Tyler