Xcode 10 seems to break com.apple.commcenter.coretelephony.xpc

Running this in Terminal made it go away:

xcrun simctl spawn booted log config --mode "level:off"  --subsystem com.apple.CoreTelephony

xcode admob xcode10 core-telephony

Well it's working on both the simulator and device in Xcode 10.2.

Executing the following command in Terminal:

xcrun simctl spawn booted log config --mode "level:off" --subsystem com.apple.CoreTelephony

From the Xcode menu open: Product > Scheme > Edit Scheme
On your Environment Variables set OS_ACTIVITY_MODE = disable
Restart simulator

xcode admob xcode10 core-telephony

I found a workaround restarting the simulator.

CodeHunter