Is Data shared between devices?

I have the Unlimited plan. I have 3 smartphones and 1 tablet with this plan. The plan states I have 15 GB when tethered before being slowed down.

My question is this: is the 15 GB while tethered for each device separately, or combined?

Example: If I use 14 GB using one tethered smartphone, then use the tablet as the tethered device, do I get another 15 GB on the tablet or just 1 GB before being slowed down?

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