AT&T is the first major carrier to shut down its 3G network. What you need to know AT&T's 3G network shutdown commenced on February 22. The company first has previously published a list of phones that will continue to work following the shutdown. Anyone still using a 3G phone will need to upgrade to continue reliably using AT&T's network. It's been a long time coming, but the death of 3G has officially begun as AT&T shuts down its 3G network on Tuesday, February 22. AT&T is the first among U.S. wireless carriers to bid adieu to the aging network as it moves to repurpose the spectrum towards its 5G buildout. T-Mobile comes next after the company delayed its shutdown to March 31 at the behest of Dish Wireless . Verizon's 3G network will shut down on December 31 . AT&T already released a list of smartphones that will still work after the shutdown in case you're curious, but there's a good that your phone is among them if you