Can I change my plan mid-month?

Of course!

If you're currently on The Basic or Moderate you can upgrade your plan anytime. If you're on the People's Choice plan, you can upgrade your plan to the All-In and the change will take place during the next billing cycle.

If you’re on The All-In unlimited plan and would like to downgrade or if you would like to upgrade to The All-In plan, you can request the change anytime, but it will not take effect until the next billing cycle.