I used to listen to JazzFM and in fact, I won one of their Christmas competitions many years ago.
There were lots of goodies, some Gin and a signed Jeff Goldblum album from when he performed there. But the main prize were the middle seats of the front row for Gregory Porter at the Royal Albert Hall. An excellent evening, made a weekend of it and stayed at the Union Jack Club for a few nights being ex-military. Mrs Crafty, being Polish had not been to London before, so we did a lot of sight seeing as well.
I stopped listening to JazzFM when I discovered Jazz24, which I prefer now. No adverts and very little in the way of DJs, plus most of the tracks are just music.
Thanks for your suggestion, but I find the iPhone very good for streaming. I can use as a remote control the Linn Selekt DSM to listen to Jazz24 and Qobuz at home, listen to Qobuz and Jazz24 in the car and cast to the Amazon Echo additionally.
I try and use the iPhone for most things where I can, saves doubling up on other pieces of kit.