SMS messaging not available on iPad - how to enable? I am unable to text to anyone other then other iOS users...  I want to enable "allow SMS messaging when iMessage is unavailable" but it is not an option - how do I set this up?
You need an SMS-capable device, like an iPhone or iPad with a SIM &amp; text messaging plan.

See Use Messages with your iPhone, iPad, or iPod touch 

If you have a capable device &amp; service plan, make sure SMS is switched on in Settings > Messages