When one cop tells the other about the kidnapping over the phone, both use their normal, hand-held phones while driving. Since both are cops, they should know that doing so is against the law. In addition, both are driving BMWs which have handsfree sets.
The BMWs used by the MEK all have Munich licence plates. However, this show is set in the state of North Rhine-Westphalia, not Bavaria. The cars would either have licence plates from the city where the MEK is stationed or licence plates issued by the Ministry of the Interior (ie. NRW-4-1234).