Unlimited data upgrade is available for no charge.

Is unlimited data really unlimited?

In the confusing, arcane world of cellular service plans, “unlimited data” often doesn't really mean unlimited. Instead, it means your speed gets reduced if you use too much. Yeah, you can slurp all the data you like, but you'll do so at nearly unusable speeds if you get too greedy.

Does unlimited data mean its free?

Unlimited full speed data - this means you can access what you want, as often as you want to and it will always be at full 4G LTE speed. Unlimited data, then slowed - these plans allow you to access as much data as you want to (unlimited) but only some of that data will be at full speed.