T-Mobile USA has announced plans to bring Data Stash -- a policy rolling over unused 4G data from each month -- to new and existing Simple Choice prepaid subscribers, having previously limited the perk to postpaid customers.
The prepaid benefit takes effect on March 22nd, and as with postpaid will come with a "Starter Stash" of up to 10 gigabytes. After that bandwidth disappears, prepaid users will begin rolling over any unconsumed data in their plan from month to month. Stashed data will remain available for up to a year.
Data Stash was first introduced in December, and has since been copied by AT&T, which launched Rollover Data in January. Unlike T-Mobile's offering, though, any unused AT&T data expires a month after it's accumulated.
Verizon has yet to announce a similar policy so far. Sprint's main plans offer unlimited data, but there is no rollover for prepaid.
The change may have an impact on the iPhone world. When the iPhone 6 and 6 Plus went on sale last year, US customers ordering from Apple could initially only choose a T-Mobile model if they wanted unlocked service. While they were not beholden to using T-Mobile, many customers may have gone that direction regardless. SIM-free devices arrived at the beginning of the year.