Cell towers in Montfermeil (Seine-Saint-Denis)

Declared locations include Les Cèdres, 9 Rue Utrillo, rue du Vieux Chateau de l'Abime, 111 avenue Daniel Perdrige, 12 Avenue Marcel Dassault and avenue Daniel Perdrige 111.

ANFR has approved one new site that is not live yet, plus additions on 4 existing masts. New: Free Mobile (4G and 5G, including 5G at 3.5 GHz) at 231 Avenue Gabriel Péri. 7 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

2014 was the busiest year, with 19 new systems, most of them 4G. Local 5G started with Bouygues Telecom in November 2020; Free Mobile followed in December 2020, SFR followed in August 2022. The oldest transmitter still listed here goes back to 1996.

The highest support stands 38 m at rue du Vieux Chateau de l'Abime (building). The median height of measured supports is 26 m.

3.5 GHz 5G is declared by Bouygues Telecom on 3 of its 5 masts, Free Mobile on 3 of its 4 masts, Orange on 3 of its 4 masts and SFR on 1 of its 2 masts.

Nearby, Chelles (2.2 km to the south-east) has 30 masts, more than here.

Of the 12 masts in the commune, Orange is the only carrier on 3 masts.

By mast count, Montfermeil is 31st of the 36 Seine-Saint-Denis towns that have five or more. With 12 masts for 28,703 residents, or 4 per 10,000, it has fewer masts per inhabitant than the median for those towns (7).

7 pylons and 5 buildings carry the commune's antennas.

Source: operator declarations to ANFR, as of October 2026. Projects that are only approved are left out of the totals.