Mozillion Review

Table of Contents Plans Value for money Extras and benefits Network Which network does Mozillion use? Coverage Speeds Frequencies Customer Service Conclusion Alternatives

Plans

Mozillion offers various different plan types, including phones on contract, SIM Only, and even travel SIMs, as well as some plans that are classed as Pay As You Go.

We won’t go too deep into the travel SIM side of things, but in short this is an eSIM that can be used in over 200 global destinations (depending on which plan you choose). So it’s a handy option if you’re heading abroad.

Mozillion’s main offerings though are its domestic plans, details of which can be found below:

Mozillion Plans

	Mobile phones	SIM Only
Plans Available	✔	✔
Max Data Allowance	Unlimited	Unlimited
Contract Length	24 months	1, 12, or 24 months

As you can see, Mozillion sells a wide variety of plans – not just of different types but also of various durations and with a selection of data limits, topping out at unlimited.

Its plans all also include unlimited calls and texts, uncapped speeds, and EU roaming. You can also optionally choose to get an eSIM rather than a physical SIM card.

Value for money

SIM Only Deals

	10 GB data UNLIMITED mins UNLIMITED texts 1 Month Contract	£7.00 a month View Deal
	100 GB data UNLIMITED mins UNLIMITED texts 1 Month Contract	£13.00 a month View Deal
	Unlimited data UNLIMITED mins UNLIMITED texts 1 Month Contract	£23.00 a month View Deal
View All Mozillion Sim Only Deals

With its standard pricing Mozillion is a fairly affordable network – and one that comes with the promise of no mid-contract price rises.

But it can become even better value through its ‘Kill Your Bill’ scheme. With this, you open the Mozillion app before you shop, then purchase a gift card for the store you’re going to (with a selection of over 220 stores included).

Then pay for your shopping (online or in store) with the gift card, and Mozillion will apply a discount to your phone bill, with most users apparently able to bring their bill down to zero within the first month.

So you’re not spending any extra on your shopping – just jumping through a couple of hoops – and you’re potentially saving massively on your bill.

Just double check the plan you’re buying includes ‘Kill Your Bill’ if this perk is important to you.

Extras and benefits

The chart below shows which core features are and aren’t available on Mozillion, then under that we’ve explained Mozillion’s take on these features in more detail.

Mozillion Perks and Policies

5G	✔
Free Roaming	✔ (in EU)
Tethering	✔
Wi-Fi Calling	✔
VoLTE	✔
Data Rollover	✖
Spending Caps	✔
Unlimited Data	✔
Family Plans	✖
Credit Check	✔

5G

Like most networks, Mozillion gives you 5G as standard, on top of which your speeds aren’t capped, so you can make the most of your plan and phone.

Roaming Destinations

Mozillion lets its customers roam across 41 EU destinations at no extra cost. There’s a variable fair usage limit (depending on your plan) which currently tops out at 25GB of monthly data.

Tethering

Mozillion supports tethering, meaning you can use your phone to broadcast a Wi-Fi network and get other devices online. This though is a standard feature of mobile networks, so it’s no surprise it’s offered here.

Wi-Fi Calling

Mozillion also allows for Wi-Fi Calling, meaning that you can make calls and text over Wi-Fi, helping you keep in touch with people when there’s no network signal.

VoLTE

VoLTE (which stands for Voice over LTE and is also known as 4G Calling) is also supported by Mozillion, and this lets you call and text using a 4G network, rather than being limited to 2G.

Data rollover

Data rollover isn’t offered by Mozillion. If it was, you would be able to roll over any unused data from one month to another.

Spending caps

Mozillion offers spending caps or as it calls them a Bill Cap. Essentially, you simply can’t spend on out of bundle services unless you manually top up your ‘Wallet.’ So the cap is whatever your wallet is topped up to.

Unlimited data

Mozillions sells unlimited data plans, though these come with a 500GB fair usage limit.

Family plans

Mozillion doesn’t sell any family plans, so there are no discounts or perks for having multiple SIMs on your account.

Credit checks

If you’re ordering a SIM Only plan from Mozillion then there won’t be a credit check, but Pay Monthly plans with a phone do have them.

Unique perks

Mozillion’s main perk is its ‘Kill Your Bill’ scheme, as outlined in the ‘Value for money’ section above.

Essentially though if you’re on a plan that includes this, you can buy vouchers for over 220 different stores from Mozillion’s app, and then when you use those vouchers you’ll get a bill credit. These will reduce your bill and cumulatively could drop it all the way to zero.

Beyond that, it’s worth noting that Mozillion offers eSIMs as well as physical SIMs, and that it also has a separate travel eSIM service, designed specifically for use abroad.

Network

Which network does Mozillion use?

Mozillion uses EE’s network, so it should have identical coverage and similar speeds.

Coverage

Through its partnership with EE, Mozillion has extensive 5G coverage, and where you can’t get 5G you’ll typically be able to get 4G.

The percentage listed for 5G in the chart below comes from a 2025 Ofcom report and relates to UK premises outdoors.

Mozillion Coverage

Network Type	Coverage by population
5G	At least 89%
4G	>99%
3G	Switched off
2G	99%

Check Mozillion Coverage

Network speeds

Opensignal January 2026 (speeds), and Speedtest 2H 2025 (latency)

Network	Download/upload speeds	Loaded latency (ms)
Mozillion (EE)	53.2/10.4Mbps	583.53ms
Three	51.0/9.3Mbps	405.93ms
Vodafone	37.5/7.4Mbps	449.16ms
O2	32.8/6.4Mbps	1039.19ms

While there’s not much data on Mozillion’s speeds, there’s plenty on EE’s, which are likely to be similar.

So then, in a January 2026 Opensignal report, EE was found to have an average download speed of 53.2Mbps and an average upload speed of 10.4Mbps – speeds that were recorded using a mix of 5G and 4G connections, in an attempt to replicate real world use. Notably, those speeds are higher than rival networks, as you can see in the chart above.

For latency, a 2025 Speedtest report put EE’s average loaded latency (the amount of time the network takes to respond to a request when the connection is under heavy use) at 583.53ms, which is higher (and therefore worse) than Three or Vodafone but has O2's beat.

Looking now at 5G, the January 2026 Opensignal report above put EE’s average 5G download speed at 92.2Mbps, which is worse than Three or Vodafone. However, a RootMetrics report from the first half of 2026 put its median 5G download speed at 230.8Mbps, which has all rivals beat.

The same report includes a 95th percentile speed (meaning close to the highest recorded on that network) and this came in at 668.3Mbps – beaten only by Three.

Traffic management

For traffic management, Mozillion simply says:

“We may manage traffic only where reasonably necessary, proportionate and consistent with applicable law, our published information and your contract—for example to protect network integrity or address temporary congestion. We will not describe a material, customer-specific usage restriction as ordinary network management.”

Network Frequencies

Mozillion Network Frequencies

Frequency	Frequency Band	Network
700Mhz	n29	5G
800MHz	Band 20	4G
1800MHz	Band 3	2G & 4G
2100MHz	Band 1	4G
2600MHz	Band 7	4G
3400MHz	n78	5G
3600MHz	n77	5G
26,000MHz	n258	5G
40,000MHz	n259	5G

As you can see then, the 700MHz, 3400MHz, 3600MHz, 26,000MHz, and 40,000MHz bands are used for 5G, with the 800MHz, 1800MHz, 2100MHz, and 2600MHz bands being used for 4G.

You don’t need to worry too much about this as EE – and by extension Mozillion – should have plenty of spectrum. But essentially lower frequency bands allow signals to travel further and are better at penetrating walls and other obstacles, but higher frequency bands are available in greater capacity, which can help with speed and reliability.

To learn more, head to our 4G and 5G frequencies guide.

Customer Service

Mozillion has a Trustpilot rating of 4.1 (out of 5) at the time of writing. This is classed as a ‘great’ score, and suggests a high degree of customer satisfaction in the network – including, presumably, any customer service.

Conclusion

Mozillion sells a wide selection of plans and ticks most of the boxes you might want from a network, including uncapped speeds, EU roaming, and eSIM support.

But it stands out primarily through its ‘Kill Your Bill’ perk, which has the potential to make this the UK’s cheapest mobile network – if you jump through the hoops required to save money off your bill.

All that plus a travel eSIM option, and both solid coverage and speeds, make Mozillion a very strong choice.

Alternatives

EE is of course an obvious alternative since Mozillion is using EE’s infrastructure. EE has an even wider selection of plans, plus some premium perks like subscriptions to entertainment and software services, but it also tends to cost quite a lot more.

You might also consider 1pMobile or Spusu, both of which also share EE’s coverage. 1pMobile offers some of the lowest Pay As You Go rates you’ll find, while Spusu gives you free calls to the EU.