UMI Touch And AT&T 4G LTE

Hi,
I just received a UMI Touch and love it but it seems I can only get it to connect to AT&T 2G network (Edge). Is there something I need to do? AT&T hasn't been much help. I am in Southern California, USA.

I received this bit of info, but am wondering if there any mods or flashes or even a modem swap that will halp me get on the AT&T 3G/4G Network.

Unfortunately, the 3G/4G frequencies used by AT&T are not supported by UMI Touch.

UMI Touch 3G: 900 / 2100 MHz
AT&T 3G: 850 / 1900 MHz...

UMI Touch And AT&T 4G LTE

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