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Mozillion

Mozillion Review

EE-based MVNO that sells phone contracts, SIM-only plans, and refurbished phones with uncapped 5G speeds and free EU roaming.

3.8/5
MVNO
5G Ready
Visit Mozillion

Mozillion Voucher Codes & Offers (2)

Mozillion
50% off

3 Months Half Price 10GB SIM - £3.50 a month

See details

50% off your first 3 months on Mozillion's 10GB SIM. £3.50 a month for the first 3 months, then £7 a month. Uncapped 5G speeds, unlimited calls/texts, EU roaming included, all on the UK's best network

First purchase only

Terms: 1 month rolling SIM plan. 50% off for the first 3 months.

No code needed Use offer

Ends 31 Jul 2026

Mozillion
50% off

3 Months Half Price 30GB SIM - just £4 a month

See details

50% off your first 3 months on Mozillion's 30GB SIM. £4 a month for the first 3 months, then £8 a month. Uncapped 5G speeds, unlimited calls/texts, EU roaming included, all on the UK's best network

First purchase only

Terms: 50% off your first 3 months.

No code needed Use offer

Ends 31 Jul 2026

Pros & Cons

Pros

  • EE network quality with genuinely uncapped 5G speeds, often faster than EE's own speed-capped plans
  • Free EU roaming included on all plans across 41 countries unlike EE which charges extra
  • No mid-contract price rises guaranteed on all plans
  • Sells phone contracts with new and refurbished handsets alongside SIM-only deals
  • No credit check required for SIM-only plans
  • Optional Kill Your Bill rewards turn everyday shopping at 220+ brands into credit that can shrink or even wipe out the monthly bill

Cons

  • No dedicated app for managing your SIM or plan - account management is handled through a web dashboard, while the Mozillion app covers only the Kill Your Bill rewards scheme
  • No 24/7 support, with customer service hours of 9am to 7pm on weekdays and 10am to 4pm at weekends
  • EU data roaming is capped at 25% of plan allowance, restricting heavy data users abroad
  • No included global roaming outside the EU without pre-purchasing wallet credit

Mozillion Overview

Mozillion is a UK mobile provider running on EE's network that combines SIM-only plans, phone contracts, and a refurbished phone marketplace into a single platform. Based in Brighton, the company has grown to over 6,100 Trustpilot reviews since launch.

What distinguishes Mozillion from most MVNOs is that it actually sells phone contracts with handsets, including both new and refurbished devices. Customers can buy a Samsung Galaxy S26 or iPhone 17 on a pay-monthly plan, or pick up a quality-tested refurbished phone with a 90-point lab guarantee. This puts Mozillion closer to a full mobile retailer than a typical SIM-only MVNO.

All plans run on EE's network with uncapped 5G speeds, a notable advantage since EE itself caps speeds on most of its own plans. EU roaming is included on all plans across 41 countries, and the company guarantees no mid-contract price rises.

Coverage & Speed

Mozillion provides coverage through EE's network, identical to direct EE customers. EE has the widest 4G coverage in the UK at approximately 99.8% population coverage and 5G reaching around 66% of the population as of late 2025, expanding towards 99% by 2030.

99%
4G Coverage
Yes
5G Ready

Plans & Pricing

Mozillion offers SIM-only plans on 30-day rolling, 12-month, and 24-month contracts, plus pay-monthly phone contracts with new and refurbished handsets. All plans include unlimited calls and texts, uncapped 5G, EU roaming, and no price rises.

Roaming

EU roaming is included free on all plans across 41 countries with unlimited calls and texts. Data roaming is capped at 25% of the plan allowance, up to a maximum of 25GB. For non-EU countries, Mozillion offers a wallet top-up system and separate travel eSIMs covering over 200 countries.

Our Verdict

Mozillion is a well-rounded mobile provider that offers more than the typical MVNO. The combination of uncapped 5G on EE, free EU roaming, phone contracts, and a refurbished phone marketplace creates a compelling package, particularly for customers who want a one-stop shop for both a device and a plan.

The pricing is competitive across the board, and the no-price-rise guarantee adds welcome certainty. The 4.3 Trustpilot rating from over 6,100 reviews indicates generally reliable service.

Account management is handled through a comprehensive self-service web dashboard - covering data usage, payment details, plan changes, extra data, number transfers and eSIM setup - backed by UK customer service seven days a week across phone, email and live chat. The main gap is the lack of a dedicated app for managing your SIM (the Mozillion app powers the Kill Your Bill rewards scheme rather than account management), something customers regularly ask for. For customers happy to manage their plan through a browser, Mozillion delivers strong value on the UK's best network.

Quick Specs

Type MVNO
Host EE
Pay Monthly

Phone contracts are available with new and refurbished handsets from Apple, Samsung, and Google. Examples include refurbished Samsung Galaxy A55 from around twenty-two pounds per month and new iPhone 17 models. Refurbished devices come with a 90-point lab test guarantee.

SIM Only

SIM-only plans on a 24-month contract range from 1GB at three pounds per month up to unlimited data at twenty pounds, with 30-day rolling and 12-month terms also available at higher monthly prices. Data-only and mobile broadband SIMs are offered too.

View Mozillion Plans