Hi if I change my plan can I change it back to the original plan after a couple of months?

Hello DavidJo_1801367 . The beauty of Smarty plans is that you can change each month to suit what you need.

You will just need to choose before it auto-renews the existing plan.

Depends on what plan you currently have. If it's a time limited promo plan or a plan that is no longer available such as 120GB for £12 then the answer would be no.