Anyone know of a good app for recording phonecalls?

Hi guys! I've applied for a job as a summer substitute journalist at a local newspaper. Even though I have no formal education within the field of journalism, they have agreed to hiring me for one week of probation first, to see if I got any talent... :) So now I'm trying to prepare as good as I can, so I'll do a hell of a job there! :) One of the things I would like to do, is to be able to record phone calls while doing an interview, so I can come back and listen to it afterwards, so I'll not miss any important elements when writing out the article. Yeah, I know, there will not always be time to do this, e.g. when there has been an accident that needs to be reported quickly, but I would really want to have the option to do this in the situations that allows for it to be done. So, does any of you know of a good, accessible app that will let me do this? I've heard of an app called Recorder that does this, but it has, as far as I know, small limits to recording time, and you'll have to pay a million to get more. It also wouldn't enable recording of incoming calls, which isn't actually that important, but it would be nice to have that option as well. I'm also not sure to the degree of which this app is accessible with VoiceOver. I've also heard that Google Voice can do this. But for me it seems kind of hard to have to set up a new account to be able to call people, and if I've understood it right, Google Voice gives you a new number that is used to place the call that people can't reply back to. I really want to call from a number that people can use to reach me on later, in the case where they e.g. remember something crucial that they had forgotten to tell me. Man, this post got too long! Sorry, folks! ;) Any great tips on this, or other related hints and tricks that works for being a journalist, will be very highly appreciated! Wish me luck! ;)