Besides what has been said, you would start to notice something strange when your phone doesn't get signal anymore. If you have any other wireless device, like a radio, you would find too strange that none of them are working.
That's the important point here, though - would they recognise the accent, or would it sound too different. I'm not really sure of the answer.
Besides what has been said, you would start to notice something strange when your phone doesn't get signal anymore. If you have any other wireless device, like a radio, you would find too strange that none of them are working.
Not an issue, they won't have them with them to use.
Then you must be talking about some hardcore naturalist anti-techies. When I go on vacation, I turn off my cellphone for long periods, but once or twice a day I'll turn it on just to see if anything important's going on. Even without considering work (and my last "staycation" I ended up going into work three of my seven days off), my mother isn't in the best of health now, and I couldn't go more than a couple of days without a text from her at least. Besides, you'd have to really try to find a spot in France where you couldn't get cell reception. When I lived there in the early 2000s, cell coverage was already at 95%...
put it this way, I'm a modern day francophone and a few times people who have heard me speak French to a fellow quebecois here in Australia (whether a friend or family member visiting) asked me where we were from as we don't *sound* French (one person thought we were german tourists) so imagine if someone was expecting modern parisian accent and heard the local patois or 500 years ago instead.
The closest comparison I can make would be to have a non-English speaker having only heard "mainstream" American accented English and suddenly being confronted by an old Scotsman born and bred in a small isolated village. *That* would be easier.