How to make my iPhone a modem?

I have an old 2WIRE AT&T router, with no internet. Is there a way to "purge" my iPhone's internet on to the router? I have my phone jailbroken, if required.

You can make it a Wi-Fi hotspot. So any Wi-Fi device can connect to the Internet through your phone.

Go to settings and turn on personal hotspot.

Don't need jailbreak. In fact jailbreak is more likely to hinder it if anything.

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