Actually, the smaller something is the more immune to EMP it is. It is long wires, cables that pick up the magnetic impulse from an EMP and convert it into electrical energy (the wire acts as an antenna). Power lines, telephone lines, Ethernet cables, etc are what pick up an EMP to the level of damaging what is connected to them. Small hand held electronics are generally much less sensitive to EMP and have to be closer to the source of the EMP to be damaged.