recording cell phone conversations

OK, so I'm a journalist like 5% of the time and I often end up doing interviews and they are often not in person. I used to record conversations with a mini-tape or MD recorder while on speaker phone, but I don't have a land line anymore and my cell phone doesn't have speaker phone. Does anyone know of any aftermarket device for recording. I'm guessing it would have to run through the earpiece jack if such a thing existed. Any other solutions for this dilemma. I guess an easier thing to do would be to get a cell phone with speaker capabilities and do things that way.

via the earphone jack, get a splitter and run one line into a recorder. Or get a celly withh a speakerphone if that works easier.

also a lot of phones can record conversations i believe. my old motorola does it, just like recording a voice note while on a call i think.

Just request a transcript from the Department of Homeland Security. :)