To cut a long story short, bought a new mobile which turned out to be crap so gone back to the old one (samsung s7330). Had google mail application on it before but deleted it when I thought I was getting rid. Just re-downloaded it but now it won't work at all, all I get is the following message: ' Your phone does not have the appropriate certificate to communicate with the server'.

What does this mean and how do I fix it?

Cheers

have you tried turning it off and back on again?

maybe need to clear the old certificate. Did all of the files from the old install get deleted?

I googled the error you typed and no1 in the list was this:-

gmail mobile app certificate error

Presumably you did exactly the same though and the above doesn't work 😉

allthepies – yes actually I did, I just get a message saying 'unsupported content'.