Why is iPhone5s data going to iPhone5 vice versa?

A family friend upgraded to the iPhone 5s and gave me his previous iPhone 5. I don't have a Sim card in it yet because i'm waiting to be sent one. Anyway, I've taken pictures on it and stuff. We have found out that our info is going to one another. Our pictures, his contacts have come to me, apps have too but they haven't downloaded properly and now won't delete. I'm 70% sure that when I got it I erased all content and settings. But now with my pictures and apps I have downloaded I don't want to do it. I can't send the pics to anyone cos of the no Sim card problem.So, what can I do. Oh and also, I very rarely have a Wi-Fi connection. Please help! What do I do? I really don't want our data to go to one another again!

Restore it. The likely problem is the Apple ID still assigned to both iPhones. Once you have yours in the 5 & he/she has his/hers on the 5s then this would not happen again.

iTunes would be able to do it, no Wi-Fi connection needed.

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