Free Mobile Hotspot apps? Iphone OR Android?

I'm looking for an app for iPhone or Android that creates a mobile hotspot. I know, technically you're supposed to pay for that service, but technically I don't feel like wasting money on something I know can be done for free. I know the apps are out there, but the one I had crashed and burned. If you know of any free apps that create a mobile hotspot, I would greeeeatly appreciate the knowledge!

Easy for android root the phone than go to the google play store and add a Wi-Fi tethering app

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