EMP weapons to ruin control networks, computers and iPhones too, are more likely to be used than nuclear bombs. Untested in warfare but not for long. China has been adding Electromagnetic Pulse capability to its targeted radar capability. This makes US aircraft carriers hard to defend. It's rumored the British can deliver an EMP in an artillery shell. The US Air Force won't discuss the kill-range of existing AESA targeted radars. h/t Strategy Page.
( Ed: An aerial burst of a small atomic bomb will do the same. Even outer space will deliver an EMP blast some day - a Carrington-type event from the sun or a nearby supernova.)
|High altitude bomb - radius of data damage|