UK mobile provider on the EE network selling SIM-only plans from £4/month, certified refurbished and brand-new handsets, pay-monthly contracts and Travel eSIMs — with uncapped 5G, EU roaming and no mid-contract price rises.
Codes last checked: 13 July 2026
Travelling to USA, Canada or Mexico for the World Cup? Take 25% off Travel eSIMs for those countries using code WORLDCUP25. Fast, reliable mobile data as soon as you land. Plans from just £2.
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
Avoid roaming fees with Mozillion's Travel eSIM - instant mobile data, the moment you land
One eSIM, mobile data in 201 worldwide destinations for a whole year - take 10% off with code
Take £5 off any Samsung phone at Mozillion, code valid on pay monthly phone contracts and SIM free phones.
Take £5 off any iPhone with code APPLE5. Available on phone contracts and SIM Free phones.
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
Samsung Galaxy S25 Ultra Titanium Whitesilver 256GB Brand New + Pay Monthly SIM All Pay Monthly SIMs Unlimited Unlimited 24-Months
Samsung Galaxy S25 Ultra Titanium Whitesilver 256GB Brand New + Pay Monthly SIM All Pay Monthly SIMs Unlimited Unlimited 24-Months
Samsung Galaxy S25 Ultra Titanium Whitesilver 256GB Brand New + Pay Monthly SIM All Pay Monthly SIMs Unlimited Unlimited 24-Months
Samsung Galaxy S25 Ultra Titanium Whitesilver 256GB Brand New + Pay Monthly SIM All Pay Monthly SIMs Unlimited 100GB 24-Months
Prices shown are from the retailer's product feed and may vary. Click through to Mozillion for the latest pricing.
Free 25GB data boost with VASB25 — Low-cost UK SIM-only on EE — pay just 1p per MB, minute & text
Mozillion is a UK mobile provider operating on the EE network — the UK's most consistently ranked carrier in independent coverage and speed tests — and is positioned as a single-stop store for new and certified-refurbished handsets, SIM-only plans, pay-monthly contracts, and Travel eSIMs. The brand sits in the same MVNO bracket as Smarty, iD Mobile, and Lebara on the SIM-only side, but adds a refurbished-phone marketplace that competes with Back Market, MusicMagpie, and Reboxed for second-life handsets — useful when buying a phone and a SIM in a single transaction rather than across two retailers.
The SIM-only ladder starts from £4 a month and runs through standard data tiers up to unlimited, with uncapped 5G and 4G data speeds, inclusive EU roaming across 41 destinations, no mid-contract price rises, and the Pay Monthly Plus tier offering enhanced allowances at £15. Pay-monthly contract phones bundle the handset and SIM at standard contract pricing, certified refurbished handsets carry independent grading and a warranty, brand-new handsets sit alongside the refurbished catalogue at competitive prices, and the Travel eSIM range covers data-only roaming for countries outside the standard EU allowance.
The EE network backbone is the main practical differentiator versus other MVNOs at the £4–£15 price point — Smarty and iD Mobile run on Three, Lebara on Vodafone, and the network choice matters significantly in rural and motorway coverage where EE consistently scores highest in Ofcom and RootMetrics testing. The 'no mid-contract price rises' guarantee removes the standard RPI+3.9% annual hike that erodes value on long-tier contracts at BT, Vodafone, and O2, and the certified refurbished grading process is independently audited rather than self-attested.
Discount windows on mobile providers follow the September Back-to-School and student-switcher season, Black Friday and Cyber Monday weekend (the highest-density window for SIM and handset percentage-off codes), the post-Christmas January gifting refresh, and welcome offers via the affiliate network for first-time customers. Practical buying tip: if you are buying a refurbished handset and a SIM in the same transaction, check whether Mozillion's bundled pricing beats sourcing the phone from Back Market and the SIM separately — the single-vendor route is more convenient but the savings only justify the bundle when the per-component prices are competitive, so cross-check the handset model on Back Market and Reboxed before committing to the bundled tier.
— MoneySaverCodes Team
