TunedOn has released a new app, Texto, that allows iPhone users to setup and send pre-written canned text messages via the iPhone’s built-in SMS app. Users can choose from a list of pre-defined short messages such as “running late” or “I’m here” or create their own custom entries. Using the in-app SMS feature introduced in iOS 4, tapping on a canned message opens the iPhone’s native SMS compose screen where users can add additional text or simply send the message as-is. Users can also associate canned messages with individual contacts from the iPhone address book allowing quick access to frequently-used messages or responses. Texto is available from the App Store for $1 and requires an iPhone running iOS 4 or later.  The developer indicates that an iPod touch version is currently under development.