That's why I ask everywhere and I haven't received a message anywhere yet. o2 knows nothing but the phones it sells. although it supports a lot of what is not on the list. I know on the forum that someone has a vodafone and it works there. from the firmware I only know that there is a file mbn 02czech. But zenfone 7 pro also has it and so far VoLTE is not working. The only option is probably to buy and try. If anyone is from the Czech Republic, let me give you info