A3G phone cannot communicate through a 4G network, but newer generations of phones are practically always designed to be backward compatible, so a 4G phone can communicate through a 3G or even 2G ATT is taking steps to shut down the 3G network, so you can do all the things you love only faster. This means your phone won't work once 3G goes away by February 2022 and you'll need to change it. It could be that the phone just needed an upgrade for 4G/LTE. If you are connecting at 4G/LTE then there's probably nothing else you need to do Itis being regularly updated to reflect current information around the 3G shutdown. As soon as late 2021, major telecommunications companies in the U.S. will start sunsetting their 3G — or 3rd generation networks — to 4G technology. Providers like AT&T have already announced they will be eliminating 3G by February 2022, confirming a Thetwo frequencies that Wi-Fi uses are 2.4GHz and 5GHz. In simple terms, 2.4GHz has a lower potential top speed but penetrates better, so it has a longer range than the higher frequency, 5GHz 4G(fourth-generation wireless): 4G is the short name for fourth-generation wireless, the stage of broadband mobile communications that will supercede the third generation ( 3G ). LFAXPHR.

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