I once saw a news article on TV about this dangers. There it was said that they really have cars from government or other firms just to steal data!
They rename their portable WLAN to networks names like "McDonald's Free Wifi" (in general to Free Wifis that exists more than one time) because if you have connected to these Free Wifis once your smartphone will reconnect to them. This can happen without you taking notice of anything. If you connect to these networks it is possible that they steal your data.
So always be aware and don't forget to delete the Free Wifi Networks :)
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