If it's a Swiss phone then you still have yo dial the Swizterland country code so it would be 0041 76 ... ....
Don't forget to change your watch to the french time zone.
All the phone numbers in my phone memory are prefixed with the country code - that means I never have to worry about whom I call, from where.
If the mobile is a Swiss mobile, then it needs to be prefixed with +41 - in and out if Switzerland will make no difference.
Edit* Just tell them to dial exactly what they normally dial.
See above post.
Likewise, if you want to call CH from France, you don't have to use a country code.
However, if you want to call (in France), the person standing next to you, you would have to add the country code for France, and they would have to dial +41 76 ... to speak to you.
In all cases, you will, of course, pay a premium for roaming.
I put +41 on all numbers in my mobile, so that if I call or text when I am out of Switzerland I don't have to alter the numbers. But if I were to dial an unsaved Swiss number, from in Switzerland, I would never dial +41
As for mobiles, I've always found two things: First, you have to use the plus symbol + instead of the 00, so it'd be +4176xxxxxxx , second, even if it;s a Swiss-Swiss mobile call made entirely within Switzerland, you need to include the international code, i.e. the +41.
Don't know it that latter is universal, but it used to cause me some problems when I first came here, so every number I've stored anywhere in the last ten+ years has always included the code.
Also, be aware of roaming charges - every call made to you while you're in France will incur additional charges to you , not to the caller. These should be clearly stated in your contract, but also note that if your phone is off and you have automatic voice-mail, you may then also be charged for the additional call you're perceived to be making back to Switzerland to your mailbox number.
Whether they are programmed or dialled.... nothing needs to be changed, just dial however they normally do! Lets not complicate this!
(It really is quite simple and straightforward)
However, you can phone a French number from a Swiss phone in france without using the country code.
Sometimes, but not if you are in the US or Canada.
Only if calling from the US or Canada. In Italy, France, Germany, Belgium, Norway, Sweden, Slovenia, etc. either work.
Tom