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Save money on your mobile phone bill with one of the easiest ways to cut your monthly costs and keep more money in your pocket.
Team
04 Sep 2026
All guides
6 min read
Guide
Kill Your Bill the smarter way to shop and the easier way to save
By Mozillion Team•
Imagine this: it's the end of the month, and your phone bill arrives. However, instead of wincing at the outstanding amount, you simply … don't pay it.
Yes that's right, you don't pay it.
This is not because you're cancelling your contract, not because you're switching providers, and not because you're hoping to ignore it for this month – you don't pay because you've killed it with the shopping you have already been doing.
Welcome to Kill Your Bill, the Mozillion feature that turns your everyday spending into free phone bill that costs you nothing.
You may be wondering how this actually works, as it seems too good to be true. Well, it isn't.
To make this possible, all you need to do is
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Shop at places that you already spend with – think ASOS, M&S, Deliveroo, Starbucks, Just Eat and hundreds of other brands that are included on the Mozillion app.
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Then, instead of paying directly with your usual card, you purchase a gift card from that retailer on the Mozillion app – just put in your desired amount and check out with the gift card.
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By using the Mozillion app, you can earn up to 17% cashback on your purchases.
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That cashback will then land instantly in your Mozillion account, chipping away at your phone bill. Just keep shopping the way you usually do, and by the time the end of the month rolls back around you have Killed Your Bill without even realising it.
No extra spending and no changing your habits.
You're simply just directing your money through a brand's gift card while pocketing the returned reward for doing so a credit to your Mozillion phone bill, which is shrinking every time when you shop.
Why this actually makes sense
Many "get cashback" schemes make you download multiple apps, screenshot proof or purchase or wait months for approval.
This is not Kill Your Bill.
The gift card you check out with is your cashback, and it immediately goes toward your phone bill, which means there is no back and forth, no waiting up to 90-days and definitely no gimmicks.
Real money and real bills are being killed.
What's more, as it's powered by Mozillion and tied with your pre-existing account, there is no need to download more apps or add new subscriptions – instead, you are just being slightly smarter with the way you pay for your morning coffee or new pair of shoes.
Who this is actually for?
Kill Your Bill is for everyone, whether you're a student, a freelancer of free spirit travelling the world.
It's especially good for:
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Those who regularly shop, whether that's groceries, coffee, restaurants, clothing or at many other retailers (and let's be honest, that's all of us)
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You're trying to cut your monthly costs without cutting out the things that you enjoy or need
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You want to pay zero for your phone data!
Kill Your Bill is a reward, but for shopping. What's there not to want?
The simple steps
From gift card to £0 bill
- 1Purchase the gift card for your selected brand
- 2Check out using the gift card
- 3Watch the cashback land straight into your account, cutting your phone bill
- 4Repeat until your bill hits zero.
- 5Any credit for this month not used will roll over into your next month's bill.
Some example retailers and their cashback amounts
Placeholder figures for illustration — each bar's length always matches its % exactly, so updating a number reshapes only that bar.
Adidas11%
Starbucks9%
Pizza Express8%
Costa8%
JD Sports8%
Greggs7%
Gymshark7%
ASOS6%
Primark6%
M&S (shopping)4.5%
Just Eat3%
John Lewis / Waitrose2%
Boots2%
Sainsbury's2%
Uber Eats/Rides2%
Aldi1.5%
Cashback rates shown are illustrative examples only and do not reflect live Mozillion rates.
So, spend £150 on your weekly shop, an ASOS order and coffee runs, and you're already getting around £10 in cashback, which is more than half a SIM-only bill.
