Is a GSM signal repeater allowed?

In Germany, the use of GSM signal repeaters, which are intended to strengthen the mobile network, is only permitted if these devices have official approval from the network operator and corresponding approval from the Federal Network Agency. Repeaters operated in an uncoordinated manner can lead to disruptions in the mobile network. Before purchasing or using a repeater, you should ensure that it is approved by your network operator and meets all legal requirements.