@Michaelirish98
Login using secret/incognito mode. Go to the plans and add ons page. Click on change plan. Click on 3G or 4G plans. Scroll through your choice of plans. Click on the plan you wish to change to and check the box to choose it. Then scroll down and choose to either schedule a change plan on next renewal or change your plan immediately (now). If you choose immediately you'll be directed to the payment page to pay for your new plan.
Keep in mind that if you're in the old rewards program your rewards if any will only be applied on your following renewal after a completed 30 day cycle.
If you schedule a change plan on next renewal it is advisable to top up your account manually with the new plan amount about a day or two ahead of your scheduled renewal. This is to avoid a common glitch with auto pay that only charges your card your old plan amount which if it is less than your new plan amount will cause an "autopay failure" and your account will be suspended.
