Best App in my view is currently Fountain App. This works fine on an iPhone. You can create a profile incl. a Sats Wallet there and both send Sats to Podcast Producers and earn Sats while listening (current promotion). It also allows to do little Clips out of Episodes that you can extract and post on your profile. Really nice. Just try it out. If you have further questions just let me know.
Regards Thomas 🙋🏼♂️
PS: Here you have for example my Podcast on Fountain.
https://fountain.fm/show/lzxAZpE8smy96tHvWURQ
PPS: If you send me you promotion code (to be found in your profile on Fountain) I can redeem it in my account and you get more Sats for listening.
I will check it out for sure