[Q] Which Networks can I get 3g in america on my SU-760?

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http://forum.xda-developers.com – I'm currently trying to use straight talk on my SU-760 in the united states. The compatable frequencies for straight talk are 850mhz and 1900mhz on the t-mobile network. They offer 3G and 4G but I only get GPRS data speeds. Is this because my phone only has 900/1800/1900/2100? What service providers can I use in the united states that will give me 3G data? (HowTos)