Mobile Joomla! 2.1.7 don't recognize by PageSpeed Insights for mobile as mobile device and return desktop version.
In server log:
homo-habilis.ru 66.249.93.42 - - [21/Apr/2016:22:31:37 +0300] "GET / HTTP/1.1" 200 12805 "-" "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Mobile Safari/537.36"
but return desktop version.
In Mobile Joomla - Testing - Preview - iPhone 6 (portrait) all normal.
In server log:
homo-habilis.ru 66.249.93.42 - - [21/Apr/2016:22:31:37 +0300] "GET / HTTP/1.1" 200 12805 "-" "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Mobile Safari/537.36"
but return desktop version.
In Mobile Joomla - Testing - Preview - iPhone 6 (portrait) all normal.