I can't receive calls or texts

When people call me, they immediately hear my mailbox. I also don’t receive text messages. I can call and send SMS, though. Rebooting didn’t help.
I already contacted the Fairphone Support but they sent me an e-mail saying that they’re “facing a longer reply time”. That’s why I’m asking here.
Thanks for your help!

A post was merged into an existing topic: Calls going straight to voicemail