Recording calls with iPhone

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iOS and iPadOS

Hello all.
I am very interested in finding a device or an app for making podcast-quality recordings of phone calls with the iPhone. I would prefer it to be with facetime audio, but as long as it sounds good, that's what matters.
I saw a couple of devices on Ebay, but I would rather check here before buying something which won't do what I need it to. Any help or advice would be greatly appreciated!

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