Which prepaid mobile network in the US allows you to tether your iPhone?

I've been looking at Virgin, who offer uncapped data on month-by-month plans, but it's not clear if they allow you to tether your iPhone (AKA use it as a 'personal hotspot').

Any suggestions?

T-Mobile allows you to tether as much and as often as you want, but reduces your performance once you hit the data limit that you pay for… It still works, just slower.

VM is capped at 2.8gbs per month

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