You (J. Random Person) may not be able to, but advertising companies probably will be able to. For example, from https://www.eff.org/deeplinks/2017/03/five-creepy-things-you... :

> According to Ad Age, SAP sells a service called Consumer Insights 365, which “ingests regularly updated data representing as many as 300 cellphone events per day for each of the 20 million to 25 million mobile subscribers.” What type of data does Consumer Insights 365 “ingest?” Again, according to Ad Age, “The service also combines data from telcos with other information, telling businesses whether shoppers are checking out competitor prices… It can tell them the age ranges and genders of people who visited a store location between 10 a.m. and noon, and link location and demographic data with shoppers' web browsing history.”