Cal, I am going to advise you to use the 114 Emergency SMS Relay Service in France and then explain my reasoning.
How to use 114 emergency SMS in France
I suggest that you create a draft text message on your phone along the lines of this, where you complete the missing Xs, for your forthcoming visit to France.
J’ENVOIE CE MESSAGE SMS EN DÉTRESSE La reception de mon portable est faible et je ne peux pas connecter à 112. J’ai besoin de Police/Incendies/Ambulance/Secours en Montagne X personnes sont blesses. Ma location est X Je m’appelle Callum X
This (if my French is correct!) reads in English:
I AM TEXTING THIS NUMBER IN AN EMERGENCY My mobile signal is poor & I am unable to connect to 112. I need Police/Fire/Ambulance/Mountain Rescue. X people are hurt. My location is… My name is Callum X
You do not need to provide your mobile number as the text packet contains this information which is displayed to the recipient (unlike when voice calling 112 at the call may have latched onto a network other than your own).
Reasoning
If you have an accident in the in the mountains and you need help, I can personally vouch that the Emergency Services would rather that you got thru to them than not.
Back in 2008 Niels Vinther, a Danish guy, was rescued after he sent a GPS (Global Positioning Satellite) message to a SPOT (A proprietary satellite-based emergency messenger system) emergency call centre, from his location in Glen Etive, 20km south of Fort William in Scotland.
His emergency message was passed from the GEOS Emergency Response Centre to Fort William Police Station, who immediately contacted the ARCC (RAF Aeronautical Rescue Coordination Centre) at Kinloss, Moray. The RAF team, who coordinate all the UK’s search and rescue helicopters, scrambled the Royal Navy Sea King from Prestwick, Ayrshire, to rescue him and he was flown to hospital by them.
He did not have a license to use his SPOT device and technically he was in breach of British Law.
I spoke to the crew at ARCC about this, when I was visiting them on another matter with Dave ‘Heavy’ Whalley, and Daz Streatham, the then RAF Kinloss MRT Team Leader. I was also visiting the Police at Fort William and took this opportunity to speak to them about it. When I returned home, I called one of my contacts at the MCA (Maritime Coastal Agency) to get their take on the incident. All the agencies agreed that he did the right thing and no further action was being taken against Mr Vinther.
In Life & Death situations, discretion is used. Therefore if your incident is life critical, text 114 when in France.
The reason I suggest that you create a draft text in French, is that often when people are in such a stressful situations they forget the obvious. I have spoken with numerous operators from OACs (Operator Assistance Centres) who all say that sometimes people have to be prompted several times before they can recall fully their own name and secondly, not all French operators may speak English.