They pat you on the head and give you an ice cream.
Discussion
It's called a "man in the middle" attack. But what can they even do to you, say, if your data is all encrypted over a VPN anyway? Nothing, right?
They will get your metadata, they could identify you. For example your phone is connected two times per day to their fake tower, that means you are passing by two times a day. That is data about you...