According to TMobile's information, the issue should be resolved. We are waiting for more detailed information.

TMobile has confirmed the problem on their end. They are working on fixing the problem.

The problem has been localized. It is a T-Mobile CZ operator outage. We have redirected outgoing traffic to a backup provider. Incoming traffic from the T-Mobile CZ network and MVNO Daktela SIM card may still experience issues with one-way audio and outages.