Use my uk iPhone for a week in France?

Ok so I'm going to a remote part of France in April from the uk and I really want to take my iphone 5s… Well I'm my only problem is I expect to use my internet a lot as I do at home(I have unlimited) I will also make calls to home and I know I will end up texting anyway I figured the best idea is to get a French SIM card as it will work out cheaper then just over £5 a day for a week because I won't be calling home everyday… So after all that here's my problem the trip I'm going on is pre organised meaning we most likely won't be stopping anywhere with a phone shop let alone long enough for me to get a sim… What I want to know is there a way to get a French sim in the uk to take with me or does anyone know of a phone company that would offer a good plan for a week but with no surprise data romeing costs… Btw if it helps I'm with EE t-mobile sorry to be so long winded

Three is perfect for this. Their feel at home service lets you use your minutes/texts/data abroad with no extra charges! I used it 2 months ago in Italy, it was great using all that data abroad. They are adding France to their list of supported countries July 1st. You need to have been with Three for 30 days for them to enable feel at home on your account, read more about it here:
http://www.three.co.uk/Discover/Phones/Feel_At_Home

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