Universal SSL uses Server Name Indication (SNI) certificates using Elliptic Curve Digital Signature Algorithm (ECDSA). SNI and ECDSA certificates work with the following modern browsers:
Desktop Browsers installed on Windows Vista or OS X 10.6 or later:
Internet Explorer 7
Firefox 2
Opera 8 (with TLS 1.1 enabled)
Google Chrome v5.0.342.0
Safari 2.1
Mobile Browsers
Mobile Safari for iOS 4.0
Android 3.0 (Honeycomb) and later
Windows Phone 7
Note: If you need more compatibility with older browsers/operating systems, such as Windows XP and Android 3.0 and earlier, please check out our Pro, Business, or Enterprise plans.
https://support.cloudflare.com/hc/en-us/articles/203041594-What-browsers-work-with-Universal-SSL-