There will be no penalty charge for termination made after the minimum contract period (24 months).
You can check Unifi service availability in your area via the following methods
Yes, you are allowed to change to the higher/lower speed package at any time. However, depending on your package selection, you will be tied to a new contract period if the package offers better value such as it comes with a new device, discounted price or any other value added regardless of whether you are within or beyond the contract period.