Rollover data

Rollover data is the practice of carrying unused data from one billing cycle into the next. If your plan includes 5 GB/month and you use only 3 GB in a given month, the remaining 2 GB rolls over and is available the next month (typically with a cap on how long it can persist).

Where rollover is offered

• Tello: unused data rolls over to the next month while the same plan stays active.
• Mint Mobile annual plans: 12 months of data is bulk-prepaid, so unused data is implicitly preserved over the term.
• US Mobile pooled plans: family-pool data persists across the month; unused capacity carries over until the pool is reset.
• T-Mobile Stash (legacy): the older T-Mobile feature stored unused high-speed data in a "stash" for up to 12 months. Discontinued for new lines but still active on grandfathered plans.
• AT&T Rollover Data (legacy): AT&T offered rollover from 2015-ish through ~2020. Discontinued for new postpaid plans.

Where rollover is NOT offered (in 2026)

• Verizon postpaid: no rollover. Data resets each cycle.
• T-Mobile postpaid (current plans): no rollover. Stash is grandfathered only.
• AT&T postpaid (current plans): no rollover.
• Visible: not really applicable since standard Visible is "unlimited."
• Mint Mobile monthly (non-annual): no monthly rollover; the annual structure provides implicit rollover instead.

Why it matters

For users with variable data usage — some months heavy, some months light — rollover plans effectively give you more flexibility for the same advertised monthly allotment. A 5 GB plan with rollover behaves more like 5-10 GB depending on month-to-month variation. For users with stable usage, rollover doesn't change the value math.

Most "unlimited" plans don't need rollover — the cap is high enough that running out is uncommon. Rollover is most relevant for tiered plans (5 GB, 15 GB) where you might routinely use less than your allotment.