IPhone tethering doesn't work?

I'm not using jailbreak, I'm paying. And a few hours ago it worked, but then I got a notification on the iPhone that there was 20% battery remaining. But then it didn't work anymore. I connected it from my mac again and it showed the blue bar that it has 1 connection but in the mac it is left with that it is connecting, and then it says that either connection is timed out or it is just left that it is connecting with the 4 bars that it is first the first bar, then the second and like that and it stays like that. I can connect the iphone with usb but it is way too slow and i need a fast connection. Can someone please help me

Sometimes it can just be your network provider however I find that activating airplane mode for a minute can normally get my hotspot working again try placing your phone somewhere with good signal and connect to the hotspot via usb. If this fails to work try resetting your network settings on the phone.

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