Wi-Fi hotspot and internet connection I bought a few days ago a Hauwei P30 lite, which comes with Android 9.
In my case, I often connect to the Internet via the mobile network. When I configure the smartphone as a Wi-Fi hotspot (tethering), the smartphone apps are not allowed any more to the Internet (while the external devices exploiting that same hotspot for Internet connection are). In other words, If I use the smartphone as a mobile 4G+ modem, then no Android app has Internet connection.
For example, after enabling the hotspot, my laptop connects flawlessly to the Internet through the smartphone hotspot, so I can open for example WhatsApp web, but I cannot use it because the WhatsApp app on the smartphone is not allowed to the Internet. I find that rather silly.
My old 3G smartphone with Android 4.2.1 provides a hotspot while at the same time allowing Internet navigation from the smartphone, so that the WhatsApp scenario described above works flawlessly.
The new smartphone with a 4G+ modem does not allow that. ????
For the record, I am settled in Italy.
Well, one of the system updates has upgraded my smartphone OS from Android 9 to 10.
And that has fixed the problem.
Now my smartphone can work flawlessly at the same time as a Wi-Fi hotspot for external devices while maintaining Internet connection for itself.
Well done! I hope some of the next system updates will not revert the situation. :-)