The thing about overclocking tablets and phones is that it has very little reason to pick up on rational grounds as these devices do not run on continuous power and potential overclockers would have to trade performance (which in most people's opinion is good enough at stock anyway) for a lot more significant battery lifespan. Besides, there is very little you can possibly change about cooling so there is a lot less manouver space for real enthusiasts, when you compare the playground to desktops.
did my first overclock in 1999, so I guess it counts