New model cell phones can handle many things that were previously considered impossible or at the best, improbably. One such thing was chatting from a mobile phone. However, today, with the advent of internet on cell phone, instant messaging from your mobile phone is not impossible at all. The best IM application that can be used on mobile phones, especially smart phones, is Skype. If you have the right phone, you can make phone calls without having to make use of your cell phone minutes. A rival for the honor of the best IM app, is DriveSafe.ly, This app comes from iSpeech. Unlike other IM apps, Drivesafe.ly is exclusively for cell phones. This app is not strictly for instant messaging as it is only used for text messaging and emails. Text messaging is not strictly instant messaging but it is certainly in the same category. The app allows you to hear your texts and emails as audio and to send responses, all hands free and this makes your drive much safer, something that Skype cannot claim.