Zend certified PHP/Magento developer

Mobile browser not loading new css styles

I have the Sign Static Files setting on in Magento settings. I have verified that deployed_versio.txt has a new version number after setting up static files with setup:static-content:deploy. However for some reason the mobile Android browser particularly does not load the new versions of the static files like CSS files. It does not load new styles even with page reload. Only incognito mode loads the refreshed styles. Any ideas how to force reload?