Despite record smartphone sales in 2012, AT&T confronted the undeniable fact: there just aren’t that many new cellphone customers yet to be won. Accordingly, the company has begun shifting its focus from winning wireless subscribers to making the most of those it already has -- in part, by launching tiered data plans that are more favorable to earnings than the flat-fee, unlimited ones it offered (and has since regretted) in the past. Data revenue increased 15% in the fourth quarter. The carrier also invested $14 billion in spectrum to improve its network and is pinning its future plans on wireless for cars and home security.
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