The thing about all phone recordings is that they are entirely dependent on a whole lot of factors that you have absolutely no control over whatsoever. It only takes one of the phones to be on the edge of a cell for all sorts of distortions to occur when it switches to the next one - and also you have no idea what sort of phone the other party is using, or how close they are to it, whether they are using an external mic, a headset, whatever - no idea at all. It doesn't matter how good any individual phone is - they are all subject to the laws of phone signal distribution, and that has an automatic system of downgrading signals when they encounter the other major obstacle to a good recording - people and vehicles moving. On top of that, the number of instantaneous iusers in a single cell at any given time also alters the quality. A call can be fine one moment, and the next it's disappeared completely.
And, I'm afraid, absolutely none of this can be fixed. Well, not by using the phone anyway. If you are doing remote interviews with people, then the best method of getting a good result that I know of is to get them to record their side of the conversation on a better mic and recorder at the same time they're talking to you - and send you the file. This way, with a bit of editing, you can make it sound as though they're in the room with you. I've done this from one side of the globe to the other - it works a treat.
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