People test apps in emulators all the time, which really are Android VMs, it wouldn't be a problem to give one virtual phone hardware that can pretend to dial w

People test apps in emulators all the time, which really are Android VMs, it wouldn't be a problem to give one virtual phone hardware that can pretend to dial whatever and test the software/app layers of this very effectively. And for what the emulator can't cover, people make test calls to 911 all the time, it's often required when setting up larger phone systems. There are established procedures for how to do this.