GSM cellular telephone transmitter/receiver, location - GF82.70-P-4107-01E

Sedan 

Fig 1: Identifying GSM Cellular Telephone Transmitter/Receiver, Location (Sedan)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

T-model 

Fig 2: Identifying GSM Cellular Telephone Transmitter/Receiver, Location (T-Model)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.