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It's possible that you've already used up the 10GB of data during this billing cycle, since that allowance is calculated separately—once it's used up, it disappears, and the next allowance will appear at the start of the next billing cycle.

The iPhone APN is hidden; what you see is just the “Personal Hotspot” APN.

You've used up that 10GB of data; it will reappear in your account at the start of the next billing cycle.