ISPs have been experimenting with implementing bandwidth caps since 2008, when Comcast, Time Warner Cable and AT&T, all announced they were trialing new capped services. Implementing data caps effectively has proven to be a challenge for ISPs, however, as Time-Warner Cable eventually decided to shut down a trial program that put bandwidth caps on its cable Internet services due to customer complaints about the potential for paying overage charges. AT&T last year finally implemented data caps on its wireline services by offering a 150GB cap for its DSL customers and a 250GB cap for its U-Verse customers. Verizon this week said it will soon make even "grandfathered" subscribers to move from $30 per month unlimited data plans to tiered plans when they upgrade to 4G LTE phones.
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