A hacker uses the beamforming of cellular towers to focus radio hot spots in the air into maser effect (plasma balls), then uses these to create marx generators in the air ionized pathways of current flow and spark gaps. The series of thunderbolts from Thor's Hammer are programmed to pummel the earth in sequences that interfere with the geomagnetic field such that cataclysmic earth quakes and eruptions begin occurring all over the earth in the wake of the waves of lightning.

Since the earth is negatively charged, and the air carries this charge at a rate of approx 100 volts of charge separation per meter height, the attack scales as the range of cellular towers increases. Some can track air-planes in flight... TL;DR: We're fucked if someone like me gets pissed.