T-Mobile US will in January 2015 start allowing its customers to roll over unused data plan capability into the next month’s usage bucket, as part of a new program called “Data Stash.”
The plan is reminiscent of the Cingular “Roll Over” feature, that allowed mobile users to roll over unused voice minutes into their usage for the next month, with unused minutes of use expiring after a year.
Data Stash apparently will have the same “expire after 12 months” provision, and will be available to new and current T-Mobile US postpaid customers on a a postpaid “Simple Choice” plan who has purchased additional 4G LTE data, 3GB or more for smartphones and 1 GB or more for tablets.
The move adds value, but doesn't directly lower data plan prices, a consideration that might be growing in importance as the U.S. mobile price war threatens gross revenues and profit margins for all the top four U.S. mobile service providers.
In the month since mid-November 2014, Verizon, AT&T, T-Mobile US and Sprint have lost about $45 billion in equity value as a result of growing perception that the marketing war now is hitting gross revenue and profit margins.