My text messages got transferred without my permission. Was this legal?

I live in a university residence. Unfortunately, I have forgotten to lock my door. One night and the next morning I noticed that both my laptop and my phone had gotten moved.
I suspect someone near me to have taken my phone couple of days ago (without permission) and he/she transferred all of my text message data on their computer. The reason I suspect this is because my Iphone does not require a pass-code anymore and my Itunes says that my phone was successfully restored and synced from a backup.
My question is: did this person commit anything illegal? Is it illegal to transfer my text messages on their computer without my permission?

In my opinion, this person did not commit anything legal and it is illegal to transfer your text messages on their computer without your permission. You must inform all of your friends about this otherwise there may be some thing wrong with them or you.

Not observing good Security practises is an open invitation to Criminal behaviour

your situation was preventable but you chose not to bother

while what they may have done is not right it is unlikely it would result in any criminal charges

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