Well let's not be hasty here. Presuming someone DID come up with technology to bend time and send a person back to the 1920s, is it such a leap to think that they'd have a way of sending radio-waves back then? It's not like the signal would be intercepted or anything. As long as there's a portal within a few miles, there's no reason why the cell phone shouldn't be able to send signal through a time portal. Except for electro-magnetic interference, of course..
By the way, the "individual" (I hesitate to say "woman"), is clearly talking into the device. Are there any real old timers here? Were there mass-market Walkie-talkies back then?
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