Update 2022-08-15: Please read this bug report:
My experience, for the record (I first thought this was only about my VPNs not working):
Migrating from Sony Xperia 10 4.4.0.68 (Vanha Rauma) Device adaptation 0.0.6.3.0 installed 2020-08-04, updated with each new SFOS version since, to :
Sony Xperia 10 III 4.4.0.68 (Vanha Rauma) Device adaptation 1.0.0.142 installed 2022-08-12 following strictly the Jolla procedure (this includes checks w/ Android 11 and downloading Sony image SW_binaries_for_Xperia_Android_11_4.19.v9_lena). After the installation, backup from SD card was restored.
On Sony Xperia 10 III, VPN supplier provided .udp.ovpn files are installing without (visible) warnings.
The VPNs are not connecting on mobile data on Sony Xperia 10 III. They have been and are still working fine on Sony Xperia 10 (w/ same SIM), Sony Xperia 10 III has only one SIM and a SD card.
The VPNs are connecting OK on WiFi on both phones.
Settings → Cellular Network → Data access point → Protocol = Dual on both phones. I have tried IP and IPv6 alone. No effect in this problem but they give new connectivity problems. Set back to defaults on both phones.
I do not have other ISP’s SIM cards available for testing.
An observation - perhaps related - in application jolla-mediaplayer 1.3.1.1-1.6.1.jolla on Sony Xperia 10 III :
My playlist have streaming radio stations. Those with URL is http://77.86… do not work, those with https://stream… do work when on mobile data; On Sony Xperia 10 both do work on mobile data with the same media player version. On both phones the radio stations are all streaming fine when connected with WiFi. Common with the .udp.ovpn files is the usage of IP-addresses, not FQNs when failure occurs.