Summary

  • Arcep’s Decision 2026-1733 authorizes Bouygues Telecom, Free Mobile, Orange and SFR to lease their 1800 MHz frequencies reciprocally at selected sites under their 2019 mobile-sharing agreement, through 24 March 2031.
  • The authorization creates an option to combine licensed capacity where traffic is especially saturated. It does not disclose eligible-site counts, actual spectrum use, lease economics or measured changes in speed, coverage or service quality.

A permission with a defined perimeter

The important detail in Arcep’s 29 September decision is its perimeter. The four operators had submitted an amendment to their 2019 site-sharing agreement on 1 June, then sought authorization together. Their proposal concerns selected sites where traffic is particularly saturated. It adds reciprocal use of 1800 MHz frequencies to an existing framework; it does not announce a nationwide pooling of spectrum or a transfer of licences.

The authorization covers the operators’ paired 1800 MHz blocks: Bouygues Telecom’s 1765–1785 MHz and 1860–1880 MHz ranges; Free Mobile’s 1750–1765 MHz and 1845–1860 MHz; Orange’s 1710–1730 MHz and 1805–1825 MHz; and SFR’s 1730–1750 MHz and 1825–1845 MHz. Each may make its frequencies available to the other three at the covered sites. Those ranges define what can be shared under the decision. They do not establish that every block will be used together, continuously or at every site.

The eligible perimeter sits within the 2019 agreement’s site arrangements. Arcep describes sites associated with historical white-zone and city-centre programmes, 3G radio-access sharing, France Mobile and a targeted-coverage scheme. The decision leaves responsibility for deploying sites unchanged. The regulator authorizes a way to use frequencies; it does not order a new network build or certify that an upgrade has already happened.

Capacity is the hypothesis; execution is the missing evidence

The commercial logic is plausible. If one operator’s local radio layer is constrained while another has usable capacity in a compatible band, reciprocal access could increase the resources available at that site without each operator independently adding the same equipment. In a dense traffic pocket, a local change can matter more than a national spectrum total. But that is the mechanism to test, not a result established by the authorization.

Arcep has not published the number of sites eligible for the new arrangement, a traffic threshold, how much spectrum will be combined, the schedule for activation or any lease price. It has not reported before-and-after traffic, dropped sessions, throughput, coverage or customer complaints. Nor does the public decision quantify avoided capital expenditure, integration costs, operating payments or the distribution of benefits among the four operators. A regulatory permission can make an operating option available; it cannot by itself show that the parties exercised it or that users noticed.

Arcep’s broader account of mobile-network sharing helps frame the trade-off. Sharing can change the cost and deployment calculus, while active sharing can also reduce the degree of autonomous infrastructure competition. That general observation is not evidence that this particular amendment weakened competition or improved economics. The relevant question is whether the arrangement adds capacity where it is scarce while leaving each operator accountable for its own service and licence obligations.

The licence holder remains on the hook

The decision is explicit that each operator retains the rights and obligations attached to its authorization, its deployment duties and its spectrum fees. This matters because reciprocal use does not turn the four licences into one common asset. The operating boundary changes at selected sites, but legal responsibility remains attached to each licensee.

That allocation narrows one risk: a customer or regulator cannot infer from the shared radio layer that responsibility for the service has been pooled away. It also leaves open the economic question of how the operators settle integration, capacity and operating costs among themselves. The public record does not reveal those contract terms. The arrangement may be efficient, but its price and incidence cannot be read from the spectrum ranges alone.

A sunset creates a measurable decision window

Arcep authorizes the reciprocal rentals until 24 March 2031, the first expiry date among the underlying authorizations. That gives operators a defined window in which to integrate the arrangement, measure its use and decide how to handle sites as the date approaches. It is not evidence that sharing will end then: renewal, replacement or migration is not resolved in the public materials.

For investors and network customers, the next useful disclosures would be operational rather than rhetorical: how many sites enter the scheme, what fraction are activated, the spectrum actually used at peak periods, and whether comparable sites show a change in capacity or service quality. Cost data would then distinguish a cheaper way to add headroom from a change that merely reallocates existing resources.

Until such evidence appears, the defensible conclusion is narrower: France has authorized a bounded, reciprocal 1800 MHz capacity option for four operators, with individual licence duties intact and nearly five years before the first sunset.

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