Today I noticed that I have a suspicious Samsung Galaxy Note (GT-N7000) in my devices list, with a US carrier (T-Mobile - US). However I've never been to the US, I never had a SGN1, and I don't know anyone who ever did. Apparently it was registered on August 2nd 2013, but I've never seen it in the menu when I was selecting what device to install the apps to. I haven't noticed any other suspicious activity on my account.
Did something like this happen to anyone else? Do you think my account was hacked, or is it some error from Google? And if I was hacked, why would the hacker connect his/her phone to my account??