I think there are apps and websites that help you locate free wifi access close to where you are. I haven't tried them though so I don't know how reliable they are. Many hotels everywhere have free wifi access. I try to check that when booking, although it's never foolproof, sometimes your room is too far from the hotspot or it just doesn't work. But in big cities many cafes and restaurants have free wifi. In Paris you can get wifi at McDonald's and many other places.
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