Question [Q] Can i get 850mhz HSDPA Exhibit 4g ?

Hello everyone, it's possible to enable 850mhz HSDPA band on the exhibit 4g? i've bought it unlocked and using it on Telcel mexico, but telcel only works on 850/1900 mhz HSDPA HSDPA+ while the exhibit only works on 1700/2100, so it's working only on the slow edge network :-/ . It's there a way to enable the 850 or 1900 band on the exhibit? :eek: i've read its possible in other samsung phones..
Thanks.