General

I havn't been in the cell phone industry in about 2 years but is their a new type of cell phone cloning? Back in the day it was copying one phones esn or imei or sim card information onto another device so the network thought the 2nd phone was the first.
But I had a lady call in to me yesterday saying her smartphone had been cloned and they now had copied all the information in it and could listen to everything she said.
Does this actually happen or is this lady of the aluminum foil hat variety?