Tough question:

I'm currently using my 7100t from T-mobile usa in Germany without any problems. If 5 are working fine with Orange, i'd try to use the one that isnt working with vodafone with Orange, perhaps it is only a vodafone problem. Does Vodafone France have the 7100 series in their selection of phones, perhaps it lies on that, not really sure where to send you, perhaps try calling vodafone customer service there in France, but if your french is like mine, you are SOL.

Best of luck


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