Please beware that when changing your plan any accumulated data is stolen by ID Mobile and does not rollover. It cost me 100gb last month.
This is acceptable though because it's covered in the t's & C's that most people including me never read, they are not written for the customers benefit though are they?
I spoke to their sales team twice (yes, I waited forever to speak to someone!) I was never warned of this deception.
Treat your dealings with ID with care ID like all other mobile companies have limited or no integrity whatsoever.