Hello! I walked the camino in June. I carried my valuables on me at all times in a tiny fanny pack. I usually would bring my backpack into cafes and place it at my feet, but a lot of times, in really small towns, people leave their packs outside. It's really up to you what you do, but I would...
There is wifi available at almost every cafe and alburgue/hotel. You can send pictures through imessage if you and the other person both have iphones. That does not use data. You could also share them on Facebook if you have that!
Buen Camino!
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