Setting up a hotspot on an iPhone?

So I just got this iPhone and I only bought 3gb of data, but since my mom has unlimited data (she was grandfathered), is there a way that I can connect to her phone through Wi-Fi while she's using her 4G while on a road trip? Like ca. I set up a hotspot on her phone and then connect my phone to it? If so, how can we do that?

Go to the Settings app on your iPhone - in iOS6, there should be a shortcut saying 'Personal Hotspot'. Tap that. If not:

1) Go to Settings > General > Cellular
2) Tap 'Personal Hotspot'
3) Tap the Toggle to the 'On' position.

Users that wish to change the password can tap on the password field and type a new password. The Wi-Fi network should then be available to select and connect to on your other device.

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