Cell towers in Boulogne-Billancourt

6 supports are declared underground, in a gallery or a tunnel. For questions about exposure, see the exposure guide.

6 underground or tunnel sites and 63 buildings and 1 church or religious building carry the commune's antennas.

Masts stand at 84-86 Rue de Silly, Ambroise Paré, Metro L10 Pont de St-Cloud, Métro Boulogne J.jaures L10, Métro Marcel_sembat L9 and Métro Pont de Sevres.

Over the past 12 months ANFR recorded 61 new systems here. ANFR has approved 5 new sites that are not live yet, plus additions on 18 existing masts. New: Free Mobile (4G and 5G, including 5G at 3.5 GHz) at 45 Rue Marcel Bontemps, Free Mobile (4G and 5G, including 5G at 3.5 GHz) at 8 Rue Maitre Jacques and Free Mobile (4G and 5G, including 5G at 3.5 GHz) at 54 Rue de la Tourelle. 46 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

Systems from 1995 are still on the register. Bouygues Telecom opened 5G here in November 2020; Orange followed in November 2020, Free Mobile followed in December 2020. 2013 was the busiest year, with 145 new systems, most of them 4G.

Most antennas sit on rooftops (63 of 70), so heights stay modest; the tallest support is 228 m at Billancourt.

3 masts carry all four networks; 19 supports carry only Bouygues Telecom.

Among the 36 Hauts-de-Seine towns with at least five masts, Boulogne-Billancourt ranks 2nd by mast count.

On 3.5 GHz, the fastest 5G band: Free Mobile on 25 of its 29 masts, Bouygues Telecom on 20 of its 34 masts, SFR on 16 of its 21 masts and Orange on 15 of its 20 masts.

2.2 km to the south-west, neighbouring Sevres has only 21 masts.

At 6 km² with 119,019 residents, the commune is dense enough that most antennas sit on rooftops rather than pylons. It is part of the Métropole du Grand Paris intercommunal grouping.

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