next g?

[jamex101]

okay first of all forgive the ingorance and sheer stupidity.
i just bought a brand new htc sensation off ebay and was told it is a Z710E model which is the non next g version of the sensation
blah blah blah phone finally gets here and its the Z710A model; the telstra next g one
now to the question: i'm currently with tpg and thus not with next g; will the phone be limited in any way? would the phone be better with the non next g version? if so why?
and if anyone can respond quickly thank you very much!!!!