T-Mobile today unveiled a monthly data rollover plan for consumers and business customers called “Data Stash,” but the plan still won’t allow workers to share their data with others in a work group.

Data Stash works much the same way for users who have a Simple Choice plan (or Simple Choice for Business Value Plan) and have purchased 3GB or more of LTE data per month for smartphones and 1GB or more for tablets.

T-Mobile will give those existing customers, as well as new customers, 10GB of free LTE data in January. The data must be used by the end of 2015, and once it’s gone, each month of unused data in a plan can be rolled over monhtly for up to a year.

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