Or you can go full retard like me.
Buy Banana for phone calls (nokia 8110 4g)
Remove Kaios
Install GerdaOs
Randomize Sim imei, mac address as you wish
It supports LTE so you can buy internet only sim and share net with other phone. In my case pixel with grapheneos.
Just look at that beauty :)
https://image.nostr.build/1a44b9a1852568c853e2dd1f74fd7d416ab41c1c7776b2e5cc500605240e759f.jpg 

 Are there portable hotspots that support random IMEI and eSIM? 

 +1 on the way fren/followed