Cell towers in Voiron (Isère)

Declared supports include 1 camouflaged "tree" pylon, with pylons making up most of the remainder.

Place names on the register include Champ de Loyat, Le Bavoir, Le Picheras, 30-36 boulevard Becqart Castelbon, 103 boulevard Denfert Rochereau and rue Louis Leprince Ringuet.

ANFR has approved one new site that is not live yet, plus additions on 4 existing masts. New: Free Mobile (4G and 5G) at Route de l'Etang. 10 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

ANFR lists a 45 m pylon at Le Bavoir as the tallest structure. The median height of measured supports is 25 m.

2015 was the busiest year, with 25 new systems, most of them 4G. Bouygues Telecom switched on the first 5G here in November 2020; Free Mobile followed in December 2020, Orange followed in May 2022. The oldest transmitter still listed here goes back to 1993.

Of the 13 masts in the commune, Orange is the only carrier on 4 masts.

3.5 GHz 5G is declared by Bouygues Telecom on all 5 masts, Free Mobile on 4 of its 5 masts, Orange on 4 of its 7 masts and SFR on 3 of its 4 masts.

Moirans lies 4.4 km to the south-west and has only 9 masts.

By mast count, Voiron is 8th of the 43 Isère towns that have five or more. With 13 masts for 21,847 residents, or 6 per 10,000, it has fewer masts per inhabitant than the median for those towns (9).

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