No 3G/4G/5G connection when disabling Wifi - Samsung Galaxy S21 Questions

Hi everyone,
when I disable my Wifi connection, my Galaxy S21 does not automatically connect to a mobile network. I always need to disable "mobile connection" first and enable again, then it directly connect to mobile 3G/4G or %G network.
Is someone having the same issues?

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For use on locations without internet connection (e.g. on holiday) I want to be able to transfer files over Wifi from / to my Galaxy and a tablet (an iPad in my case).
On an iPad, Bluetooth is no optopn as file transfer is not supported.
Normally I can enable Wifi tethering on my Galaxy and then connect any device to the Galaxy without using an internet connection.
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Just like a home router which s not connected to the ADSL / cable modem.
UPDATE: it worked!!
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Question Wi-Fi Signal Relay Function?

Hello PRO-I users, greetings from Korea.
I've been planning to purchase a Pro-I device, and I wonder if this device has a Wi-Fi relay function, i.e. mobile hotspot with Wi-Fi signal.
The problem is this; in South Korea there are lots of carrier-based Wi-Fi spots that requires EAP-SIM or EAP-AKA authentication to connect, which makes devices without specific SIM almost impossible to connect to secure Wi-Fi connection. In select Samsung and LG(RIP) devices there is a function called Wi-Fi sharing, which establishes Hotspot connection from Wi-Fi signals(NOT from 2G, 3G, LTE or 5G) under the device's hotspot name.
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2) Set device SSID as NOTE9-WIFI
3) Turn on Wi-Fi sharing
4) Turn on Mobile Hotspot function
5) Use my PC to connect NOTE9-WIFI, and connect to the internet with KT WIFI signals
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Hi.
Got mine yesterday ... answer is a negative, unfortunately, as soon as you turn on the wifi hotspot, you lose wifi and it switches to mobile data.
JP.

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