Is there a way to get 3g/4g on unlocked hox

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http://forum.xda-developers.com – I have sim unlocked att HTC one x I have simple mobile 50 dollar plan I get 3g/4g and I'm only getting edge speed witch is really slow cant do much only on WiFi I relly want to take advantage of my 3g at least Sent from my HTC One X using xda app-developers app (HowTos)