Stuttgart (dpa / lsw) – Due to a disruption in the O2 mobile network, some customers in the south-west could not reach the emergency call. As the Ministry of the Interior in Stuttgart announced, there is no evidence of a fundamental disruption to the emergency call, such as in Bremen or Hamburg. In the O2 network, cell phone calls in the afternoon were temporarily not possible for some users. The reason for the restrictions on mobile telephony was a fault on a voice transmission server, the company said. However, a large part of the telephone calls can be transmitted via other servers. They are working flat out to ensure that customers can make unlimited calls again. Calls with apps like Whatsapp were possible via data transfer servers.