4g lumia 520

Are you sure? Do your settings show 4G or are you basing this on the H/H+ in your status bar?
 
ATT's site says it has 4G HSPA+ support under the hood, so you are getting H+ speeds, marketed as 4G here. (AKA fauxG, 3.5G)
It's not LTE, but its still no slouch.
 

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