Thread:Extension talk:MobileFrontend/Doesn't work in MediaWIki 1.19/reply (3)

Then you have just the chance to try to install the REL1_20 or REL1_21 or REL1_22 branch of MobileFrontend and look if it works or not. Or maybe you have the chance to update your PHp version?

Otherwise you have to install wurfl first, to use MF. The AutoDetect Feature isn't in this old version, too. There can be other features documentated on the Extension page, which aren't in this old code :)