Ovum said the popularity of quad-play services in Europe has been damaging for pure-play mobile operators, which tend to be the smallest operators in their respective markets.
Arcep figures showed that the decline in mobile services revenue that started on the French market in mid-2011 continued throughout 2015, but that the rate of decrease remained on a downward trend.
Bouygues Telecom and Free Mobile are the first of France's four mobile operators to gain authorisation for 4G sites in the 700 MHz spectrum band.
Apple faced a legal challenge to its mobile operator contracts in France that could cost the company nearly €50 million ($56.7 million) in repayments if the claims are accepted by a domestic court.
Bouygues Group said its telecoms unit would resume its previous strategy as a standalone operator after talks on a potential merger with Orange finally collapsed before the extended deadline of Apr. 3.
Talks on a potential takeover of Bouygues Telecom by Orange are entering the home straight, although it still appears possible that a merger may not happen at all.
Iliad reported strong revenue and subscriber growth in 2015, as the enfant terrible of France's mobile market continued to be a thorn in the side of rivals with apparently unstoppable growth.
Orange hailed a return to core profit growth a year earlier than planned in 2015 and said it expects EBITDA to continue on an upward trajectory in 2016.
Orange refuted speculation that a deal to help it secure approval for a potential acquisition of rival Bouygues Telecom was imminent and said talks were still ongoing.
Orange unveiled a raft of changes to its management structure in Europe as it continues to discuss a possible deal with Bouygues Telecom that would have a profound impact on its positioning in France.