Everything completed. Bugs all fixed.
->Added minimum phone number length of 7 characters
->Rewrote PHP to use OOP, featuring the happy object SMSWorker, far cleaner
->Fixed re-sending message javascript bugs stuff
->Changed structure of PHP stuffs to be beautiful
->Restricted selection of Chosen.js options if they are not technically possible i.e. alert me 1hr before when its past 1hr before. Needs testing?
->Rewrote/reformatted AJAX to post an array of objects. Fun :)

All is done :D