Sky Mobile has launched the biggest overhaul of its Piggybank data rollover feature since the programme began in 2017. From this week, all Sky Mobile Mix customers will see their unused data roll into Piggybank with no expiry date, replacing the previous three-year cap.
The change brings Sky Mobile closer to how Giffgaff and iD Mobile handle unused allowances, but goes further in one important respect: Sky customers can also gift Piggybank data to any other Sky Mobile user, not just those on their own account.
What's changing
- No expiry: Data in Piggybank never expires (previously expired after 3 years)
- Gifting: Send Piggybank data to any Sky Mobile customer, anywhere in the UK
- Spend-as-you-go: Convert Piggybank data into account credit at £1 per GB (up from £0.75/GB)
- Boost offers: Use Piggybank data to claim O2 Priority-style rewards with partner brands
- No contract lock-in: Piggybank data stays yours even if you change plan
Why it matters
In a UK market where Ofcom's recent mid-contract price hike ban has squeezed margins at every major network, differentiation on non-price features has become critical. Sky Mobile's rollover feature was already the most generous in the industry - only Tesco Mobile's old Pay Monthly plans offered anything comparable, and those were retired in early 2025.
By scrapping the three-year expiry entirely, Sky is effectively telling customers that every GB they pay for is theirs forever. For heavy data users who occasionally have quiet months - holidaymakers, for example - that's a genuinely meaningful benefit that can be worth £5-£10 per month in realised value.
Who's eligible
The refreshed Piggybank is available to all Sky Mobile Pay Monthly customers on Mix plans from 15 October 2025, including existing customers mid-contract. SIM-only customers, handset customers and upgraders are all included. Existing Piggybank balances automatically convert to the new unlimited-expiry system with no action needed.
Best current Sky Mobile deals
To tie in with the Piggybank refresh, Sky Mobile has also launched a set of limited-time plan offers running until the end of November:
- 5GB SIM-only: £8 per month (Sky TV customers) / £12 non-Sky
- 30GB SIM-only: £12 per month (Sky TV customers) / £16 non-Sky
- Unlimited SIM-only: £20 per month (Sky TV customers) / £25 non-Sky
Sky TV household discounts remain a key lever for the network - any customer with Sky TV, Sky Stream or Sky Glass at their billing address qualifies for discounted plans.
Is it enough?
Sky Mobile has steadily grown its UK subscriber base to around 3 million, but remains the smallest of the main players. The Piggybank refresh won't single-handedly change that, but it does give Sky a genuine talking point as EE and Vodafone push their converged broadband bundles harder than ever.