Can I change or cancel my plan later?
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Yes. Upgrades take effect immediately with prorated billing; downgrades and cancellations take effect at the end of your current billing period. No cancellation fees, ever.
Does unused quota roll over to the next month?
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No — unused quota doesn't carry over; it resets at the start of each monthly billing cycle. If you regularly have quota left over or run out early, you can switch plans at any time.