[LIST] Carriers that work or do not work with /e/OS country-wise

[gnection]

Edited the first post to update the list of carriers that work in Japan. FWIW I’ve created a topic about how /e/OS works on FP4 in the country:

Fairphone 4 with the latest /e/OS installed via EasyInstaller works well in Japan

Here I would like to share my experience of using /e/OS on Fairphone 4 in Japan, where Fairphone series are not officially supported. On the stock ROM, Fairphone 4 did not conduct IMS registration or recognize VoLTE networks of docomo and KDDI. It was unnerving, but it has been reported multiple times on the official Fairphone forum that after the stock OS on FP4 was updated to Android 12 the phone no longer recognized network connections in Japan, and I guess this might be the case. I tried t…