UK Spec/ Europe Spec/ USA Spec phones

[Guest _melchett]

I just wanted to check what the actual difference is between UK Spec, Euro Spec and America spec phones. The only thing i can think of is the frequencies, which is made pretty redundant with quad band. That is especially true in relation to UK to USA, but what about Europe? They do they use the same or slightly different frequencies?

NB i've looked on wiki and there is too much UTMS etc talk for me to understand.

Thanks in advance!