Personal hotspot
Hello, what should I do with it? Megaphon operators say that the problem is in the device
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Your cellular provider is the one that sets up Personal Hotspot. It has to be activated on their end first. Then see this, How to set up a Personal Hotspot on your iPhone or iPad - Apple Support and this, If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi + Cellular) - Apple Support