I would like to upgrade My My Choice Plus 1 GB plan to a My Choice plan with 3 GB. I currently have the annual plan. When I go to change my plan, I have to cancel the My Choice plan and not given any options to change or up the number of GB. I can continue to buy 1 GB at a time but I thought it would be easier to up my plan. How can I change the My Choice plan to include more GBs?