This site is owned and operated by Comodo. There are similar sites operated by their competitors. Most of them make it very difficult to find out what the certi

This site is owned and operated by Comodo. There are similar sites operated by their competitors. Most of them make it very difficult to find out what the certificate chains (including the root certificate) are for the different products. That is the most important piece of information because that is the only way you can verify compatibility for the browsers and devices you are targeting. As recently as two years ago, I was using phones that had only the Verisign Class 2 (IIRC) root certificate (the most expensive one on the market). If you don't want to pay over $400 a year for a cert then the next best option is GeoTrust's ~$89/yr QuickSSL cert, which is installed on most phones. After that, you can try Comodo's InstantSSL certificate. Before ordering, contact Comodo's technical support and tell them you want a certificate that actually works on mobile phones. They will respond with the information you need to order an InstantSSL certificate (cheap, domain-validation-only) that has a similar (the same?) cert. chain as their EnterpriseSSL certs.