Your AT&T plan just got a free surprise upgrade - what's new
Are you an AT&T mobile or Internet Air subscriber? The upgrade is already live for you in more than 5,300 cities.
Kevin Carter / Contributor via Getty Images News / Getty Images Follow ZDNET: Add us as a preferred source on Google. ZDNET's key takeaways <ul><li>AT&T has introduced a surprise 5G speed boo… [+2258 chars]