There are and always were satellite radio options that don't have to be built in to the car. My first satellite radio (Sirius, before they merged) was actually

There are and always were satellite radio options that don't have to be built in to the car. My first satellite radio (Sirius, before they merged) was actually battery powered and portable - I could clip the antenna to my backpack and listen while I walked the dog. (This was before mobile streaming was really a thing.) Like others here are bringing up though, I've found the variety on the music channels to be lacking. These days I get more mileage out of Pandora and a few podcasts. Also a fun little note - if you have a standalone radio with active service, then turn it off and stuff it in a box, cancel the service, and wait a few months or a year before pulling it back out, you'll have free service for the life of the radio. They stop sending the device specific kill codes after a while so it will just keep working.