Wikipedia's version seems to check out. Dr Sampson didn't work in telecommunications and that patent of his has nothing to do with cell phones. Rather, this thing uses gamma radiation (a totally different part of the spectrum than the microwave region used for cell phones) and Compton scattering to produce high-voltage electricity. It's nuclear technology, which unsurprisingly seems to be the subject of Sampson's expertise.

One can't really give a single inventor of the cell phone anyway. The idea of radio telephones are almost as old as radio itself. AT&T's commercial mobile phone service started as early as 1947, and was a radio system. Ericsson developed MTSA (Mobile Telephone System A) in the 1950s, which was the first car-phone that was automated and used the ordinary phone network. In the 70's you had Motorola Dynatac coming along with the first non-car phones which used the microwave range, for which reason they're often considered the progenitors of today's cellphones, as opposed to earlier radiophones. In the late 80's you have the first (GSM) digital microwave phones. So it was all very incremental over a long time period, and involved many companies and people. So single person could reasonably be given the credit. (Even if you go with Cooper, he is only one of a half-dozen people on that Motorola patent)

But Dr Sampson surely had nothing to do with it. It doesn't seem like he's made that claim himself either, indeed does seem due to someone not understanding the claims of that patent, basically thinking it was about cell phones merely because it contains the words 'cell' and 'radiation'. It's not a communication device and couldn't be used as such, besides the health risk of emitting lots of X-rays, it would be simply be inefficient and impractical because of the large amount of energy required to produce gamma radiation.

Even today a 'portable x-ray machine' tends to be one that can be moved at all, not a hand-held, battery-powered thing.