Cell towers in Sezanne (Marne)

Masts stand at La Lune, La Guette, Les Cathelinottes, Devant Sans Souci and 7 avenue Jean Jaurès.

ANFR lists a 58 m pylon at Devant Sans Souci as the tallest structure. The median is 20 m, slightly below the Marne median of 27 m.

Systems from 1994 are still on the register. Free Mobile opened 5G here in December 2020; SFR followed in September 2022, Bouygues Telecom followed in November 2022. 2022 was the busiest year, with 15 new systems, most of them 4G.

Approved additions not yet in service are pending on 2 existing masts, for example Orange (4G and 5G) at Devant Sans Souci and Orange (4G and 5G, including 5G at 3.5 GHz) at Mail du Mont Blanc. 2 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

On 3.5 GHz, the fastest 5G band: Orange on 2 of its 6 masts, Bouygues Telecom on 1 of its 2 masts, Free Mobile on 1 of its 3 masts and SFR on 1 of its 2 masts. 5G is on 71% of masts here, against 88% across Marne towns with five or more masts.

2 masts carry all four networks; 4 supports carry only Orange.

4 masts belong to Totem and 1 to ATC France.

Romilly-sur-Seine lies 23 km to the south and has a higher 5G share (100%).

The widest declared gap between neighbouring supports is about 2 km, to the north of the centre.

6 pylons and 1 building carry the commune's antennas.

Figures above cover installations declared to ANFR as in service or technically operational, as of October 2026; approved projects are not counted.