No mobile phone signal and no broadband due to powercut?
Unless you have a backup power supply, or a satellite phone, then at the moment you would be unable to make a phone call*. This may change next year when you will be able to use an ordinary smartphone to make calls via satellite This is called D2D (Direct to device).
*If you still have an analogue landline plugged into a BT socket, then you will still be able to make a phone call.
*If you still have an analogue landline plugged into a BT socket, then you will still be able to make a phone call.
