I need "educated" reasons whether it is safe to use any wireless device during a lightning storm.
Most people said don't use it but they cannot explain why.
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Most probably yes; wireless devices are not grounded, so they are not lighting rods of any kind as it is frequently assumed. There are some theories that cell phones somehow attracts lightnings by the field they produce, but the theory behind is weak. Experimental evaluation is very hard, since lightning hits are quite rare, such events are guided by numerous parameters and there are lots of other, hard to evaluate factors.
A modern wireless electrical device should be perfectly safe, all it is is putting a metal piece near your ear, basically giving you the same chance of being hit by lightning as any other time. Older (Or more accurately, larger) technologies with larger antennas might work as a lightning rod, and thus give you a somewhat higher chance of being hit.
Basically lightning is a low frequency electric signal, very broad band, while most cell phones are exactly the opposite.