During today’s UnCarrier 8.0 media event T-Mobile announced another perk for qualifying postpaid Simple Choice business, family and individual customers that is designed to address a chief customer complaint in Data Stash. Data Stash is T-Mobile’s take on rolling over unused data for a given month into the next. Rather than allow unused data to expire, T-Mobile will let customers keep that unused data for up to a year. To launch the service, T-Mobile is putting 10GB of data in each qualifying customer’s “data bank” for those with a qualifying postpaid business, family, or individual Simple Choice account who have purchased at least 3GB of phone data or 1GB of tablet data per month starting in January 2015. T-Mobile has stated no limit to how much data users can store in Data Stash, but will only allow storage and access for up to a year for a given account.