AT&T Free Msg: ALERT! AT&T 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. Starting April 12, 2021, we may redirect your call to customer service to help you upgrade your phone. Some features like voicemail won't work during this time. To learn more or upgrade now, visit your AT&T store.