When my phone is is "resting", it displays emergency calls only. Yet I can make calls. Why is that?

Then your phone is receiving a signal. As to why your phone is showing an exclamation mark or displaying “emergency calls only”, try asking Oppo. In the meantime, maybe try a SIM replacement.

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 bynavigating to "Settings > Wi-Fi and Internet > SIM and Network" and then toggling the Wi-Fi calling option for the respective SIM slot.

Phone Displaying Emergency Calls Only

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