I use it bit differently, mainly for my Apple Watch. When I’m at the gym, I don’t like carrying my phone around, but like to have wifi connectivity in case someone needs to reach me, or so I can stream music. I bought a mini USB Wi-Fi repeater. I plug the device into a USB power bank, and then wirelessly connect the device to the iPhone hotspot, and I leave it in my car. From the gym, my watch connects to the repeater on a separate wifi ssid. Works pretty good, range is not the best, but enough to cover half of the gym.
Bought a new repeater with dual antenna, should receive it in a week. Hopefully it will extend the range