The US firm has come under increasing scrutiny in Europe over the way it operates and the amount of tax it pays.
EU antitrust regulators have accused Google of abusing the dominance of its Android mobile operating system in deals with phone makers and mobile network operators.
The accusation follows a year-long inquiry and comes as the tech giant is being scrutinised over its shopping service.
European Competition Commissioner Margrethe Vestager said in a statement: "A competitive mobile Internet sector is increasingly important for consumers and businesses in Europe.
"Based on our investigation thus far, we believe that Google's behaviour denies consumers a wider choice of mobile apps and services."
The statement said regulators also believed the firm's conduct "stands in the way of innovation by other players". Read more...