Whether you're conducting interviews, doing research, or otherwise need to document a conversation, there are many reasons you may want to record a phone call on your iPhone -- but so few ways to do it. For privacy reasons -- and due to laws that vary by state -- Apple does not allow recording through the iPhone's built-in microphone while the phone is actively on a call. Put simply, you can't hit "record" while you're talking on the phone.Also: The best iPhone models you can buy right now... Read this story