Let's say his French cell number is 06 12 34 56 78
To text him, you'll do the following.
- Add the international code (011) to the start of the number
- Next, add the country code (33)
- Finally, drop the '0' from the '06' cell phone prefix
So you would enter, in the phone number line in your cell phone -
011 33 6 12 34 56 78
Similarly, the cell phone number 6 44 55 77 88 would become -
011 33 6 44 55 77 88 =)
Hope it helps, and best of luck !