Back in the day , cell phones had a plug for an external antenna ; why they quit making them that way is anybody's guess.
Your cell antenna is probably a Wilson item , as is the one on my Newmar , the existing cable would have a threaded end similar to a small coax , that would require an adapter to the cell phone . My last phone had no antenna port but Wilson had a pad available to Velcro to the phone that worked well ; for that phone ( 3G I believe ).
Verizon no longer supports that phone and I have no Idea if the pad will help reception on any 4/5G smart phones.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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