4Call Recorder Pro for iPhone
Call Record Pro has a couple of convenient features that you may particularly like if you want to do some short-term, high-quality recording, but don’t plan on doing it for very long after that. The chief benefit is 300 free minutes worth of credits that you can use before you have to pay for anything (available only on the Pro version). You can also easily share recordings via email, iMessage, Twitter, Dropbox and even Facebook.
However, the process to record the call is a little time-consuming, requiring you to start the app, have it dial a recording number, adding your current call, and merging the two to create a three-way call (not available on Virgin Mobile or H20 Wireless). That will make it nearly impossible to turn on recording in the middle of a conversation.