The days of an ad-free Gmail experience on Android may be coming to an end. According to Android Police, the latest version of Google's email app contains references to built-in advertisements. The uncovered code hints that users will be able to save ads that catch their interest as messages, but little else is known about the company's approach to mobile ads — or how intrusive they'll be. As part of Google's broad overhaul of Gmail back in May, it introduced a new Promotions tab that displays ads closely resembling regular inbox messages. ...



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