deepak_jr11 , via OnePlus 3T , Sep 30, 2019 : After the pie upgrade, the mobile network drain has increased so much... From around 1-2% to 13-15%. Is OnePlus even noticing this or are we just having some EOL devices and they want us to upgrade to their new devices?.. Releasing a proper firmware doesn't require too much work. Hope they fix it in the upcoming updates... If we're even getting any.