Dave,
If you have an iPhone you can get these little adapters at Wal-Mart:
https://www.walmart.com/ip/Apple-Lightning-to-3-5-mm-Headphone-Jack-Adapter/54738078Should be $5 or less for the Non-Apple branded stuff.
I have a couple of them for using older earphones.
1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995