"If you miss a payment due date, your account will be put into a suspended state, meaning you will be unable to use your phone services.
You will have up to 90 days to make a payment, and after doing so your payment cycle with restart and your service will resume.
After 90 days, suspended accounts are permanently deactivated, which means you will:
So, just ensure you reactivate your plan a few days before the 90 days are up, just incase of a delay in re-activation.
Be very mindful how close it is to the 90 days. For instance if you are starting the clock now but still have 10-15 days on your current renewal, you should be fine, but if you are going like 3.5 months and a very close to renewal date, you will have to at the very least activate again even if its only on the 15 plan.