You are afraid that your phone will be damaged during a thunderstorm or other strong electric pulse?
You should't do it but the Carbon tape can protect your phone even in the microwave!
Never do this, but if you still want to do it, keep in mind that the
tape get very hot in a microwave and plastic parts can be melted. Carbon tape only protects electronic components phone because it can serve as a Faraday cage, if you completely wrap tape a phone.
Thus protect your phone from stun gun also.
You can sew the carbon tape in your pocket or a pouch and your phone will be protected.