Mobile Messenger on 3 Network - Debranded SE K800i

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Posted by Hubcap25
Does anyone know how to use Mobile messenger using a debranded Sony Ericsson K800i on the 3 Network?

I am unable to download the link from the 3 Homepage (probably since I don't have the certificates?), and installing a "generic messenger", I am unable to login.

Any help would be greatly appreciated.