I lived there 1 year and I have seen so many ways how to steal your personal belongings... Just beware:
- guys selling shawls and scarves on the beach- they unwrap it, present and under the huge material you are watching they grab your phone, bag etc.
- crowds in the subway- in general everything in subway- performers, beggers- they often work in groups. A pair of strangely clothed people is dancing, while another ,,normal'' person is taking phones of those who pay them too much attention. Or they create artificial crowd and then one of them is using it to accidentally touch your bag/pocket. -asking for an advice- it happened to my friend. She was asked about how to get somewhere, she left her bag on the bench with her friend- they haven't even noticed when the bag was gone. But, imagine, people in the park noticed this thief and showed her where he run away- there was nothing precious in the bag, so he left it in the bin.
- asking for a dance in clubs- it is sad that guys are using girls in that way... It happened to many of my friends. They were robbed in the club- somehow while dancing the bag ,,run away'' to the back and then they realized phones and purses were gone...
- asking to sign a petition to help poor children or sth like that- two girls are asking people to sigh a petition, they have also English version, it is supposed to help starving children. In the same time their friend is opening your bag. They look suspicious, I felt nervous atmosphere around. In general, me and my friends were many times abused in that way. I advise being alerted all the time. Especially if someone on the street is poking you, doesn't matter why. It's sad but you can't trust people who surround you :(