TG1600 (general TG series) question about 2G/3G/4G

Hi all -

Is there anything I need to to with the TG series to utilize 3G or 4G?  I have one with an AT&T sim card in it, but AT&T believes it's a 2G phone attached to it.  For background, AT&T is retiring their 2G/GSM network at the end of the year.  I've received a handful of alerts indicating that.  Any info/assistance on this would be most welcome.


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