Verisign is the only realistic choice if you want your website to work with older mobile browsers and low-end mobile browsers. Many phones from as recently as t

Verisign is the only realistic choice if you want your website to work with older mobile browsers and low-end mobile browsers. Many phones from as recently as two years ago only have the Verisign root cert installed in them. If Verisign is too pricey, and you are willing to lock out older and low-end devices, but not all devices, then GeoTrust QuickSSL is the only alternative. QuickSSL is cheap enough that there isn't any reason to try to find something cheaper. All other certificates being sold have one or more of the following problems: the root cert is in few devices or only in recent devices, the root cert is present in devices but will expire in the next 2-3 years, the certificate is a chained one which won't work in some devices, the root certificate uses relatively weak crypto (1024-bit key or MD5 signature), or there is some other problem which I cannot remember off the top of my head.