British satellite broadcaster Sky is adding on spectrum in the cellular sector to offer Sky Mobile. The service incentivises customers already with Sky TV and have a Sky+ box.

The halo feature of the data plans is that any leftover data for the month can be rolled over for up to three years — back when T-Mobile offered finite data tiers, it would allow unused data to carry on for only a year. Families with up to five lines can save together and share unused data as needed.

Plus, Sky+ subscribers can also sync show recordings from their box onto their phones — either by streaming or downloading for playback. Up to four devices will be allowed to Sync up in a household. Those with Sky Q boxes will get Sync next year.

Plans are available at 1GB for £10 per month, 3GB for £15 or 5GB for £20. Saved data can be applied 1GB at a time. They can also switch between plans every month. Per diem, texting and calls can come at 10p a minute or message. There’s also an unlimited call and text package for £10 per month, but free for Sky TV subscribers. Consumers are signed onto a 12-month contract.

You can pre-register for the service here. First SIMs should come out around Christmastime. Sky Mobile is a O2 MVNO.

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