

though you’d need to supply power
Go for really old ones with the crank handle for ringing. Like from army surplus and you don’t need the power :-)
We played around with these for a day in the army https://en.wikipedia.org/wiki/Feldtelefon_50 when you crank the handle while your friend is still putting down the line you can shock them.
Claim Musk is a dangerous foreign influence and force a sale like for Tiktok