PhoneTap is a tool that enables users to record phone calls and download the recordings as MP3 files after the call is completed. Ben Morris developed PhoneTap in 48 hours using Google AppEngine, but later updated it to run on a Rackspace CloudServer with MongoDB as the datastore, after winning a Twilio developer contest. The app was originally designed to use Twilio's services and was ported over from AppEngine to take advantage of the $30 free developer credit and good documentation offered by Twilio, which made it easy for Ben to get started with the platform. Ben found working with MongoDB to be straightforward, as he was able to install and integrate it into his app in just a couple hours after hearing about the contest. Overall, Ben's experience with Twilio and MongoDB was positive, allowing him to focus on other aspects of his app development quickly.