Why use one mobile phone to open a hot conference card for another?

It may be because the two mobile phones are far away, or one of them has a bad network.

Cell phone hotspot signals are not as strong as routers, and the distance affects the signals, or there is electromagnetic interference nearby.

I tried, but it didn't work. Generally speaking, after your mobile phone is connected to wireless, turn on the hotspot WiFi of this mobile phone, and the wireless network will be automatically disconnected. At present, opening this mobile phone hotspot only supports data traffic sharing.