Mozillion rolling SIM deals: 150GB–310GB big data plans compared (October 2026)

Last updated: Wednesday 7 October 2026 (Europe/London)
Next update: when Mozillion changes these rolling or upfront prices.
By: Switch Editorial Team, Switch Squid Ltd

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As of Wednesday 7 October 2026, Mozillion’s 1-month rolling big-data ladder runs 150GB for £15, 210GB for £16, 260GB for £17 and 310GB for £20 a month — unlimited UK calls and texts, no credit check on these rolling SIMs, and you can leave at the end of any month. Over 24 months the same 310GB rolling plan costs £480; Mozillion Pay Monthly Plus 310GB at £100 upfront plus £4 a month lands at about £196 if you will lock the term. SwitchSquid ranks the cash, not the headline gigabytes alone.

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What “Mozillion rolling SIM” means in October 2026

Mozillion is a UK mobile brand that sells SIM-only plans on the EE network. “Rolling” here means a 1-month contract: you pay each month and can stop when the month ends, without a 12- or 24-month lock. That is the opposite of Mozillion’s prepaid-style upfront plans, where you pay for a year or two in one go and get a lower effective monthly rate.

On 7 October 2026 the rolling big-data rungs we verified are:

• 150GB — £15 a month
• 210GB — £16 a month
• 260GB — £17 a month
• 310GB — £20 a month (honestly £20, not a teaser £15)

Each step adds a lot of data for a small monthly jump until the top rung. From 150GB to 260GB you pay only £2 more a month for 110GB more data. The jump from 260GB to 310GB is £3 for another 50GB. Whether that last step is worth it depends on whether you actually burn past 260GB — most people do not.

If you only care about the 150GB rung in depth, our dedicated guide still covers it: Mozillion 150GB SIM: £15 rolling or £180 for 24 months. This page is the full rolling ladder, plus the upfront and Pay Monthly Plus cash maths heavy users need.

Rolling ladder vs 24-month cash (checked 7 October 2026)

Prices below are as listed when we checked. Year-1 cash for rolling plans is twelve monthly payments. For the £180 upfront plan, year-1 cash is the full £180 paid on day one. For Pay Monthly Plus, year-1 cash is the upfront fee plus twelve monthly bills.

Plan	Data	How you pay	Year-1 cash	24-month total	Best for
Mozillion 150GB rolling	150GB	£15 / month	£180	£360	Trying EE coverage month to month
Mozillion 210GB rolling	210GB	£16 / month	£192	£384	Heavier streaming without a lock
Mozillion 260GB rolling	260GB	£17 / month	£204	£408	Big-data rolling without the top rung
Mozillion 310GB rolling	310GB	£20 / month	£240	£480	Maximum rolling allowance; pay for flexibility
Mozillion 150GB 24-month upfront	150GB	£180 once	£180	£180	Sure you will stay two years on 150GB
Mozillion Pay Monthly Plus 310GB	310GB	£100 upfront + £4 / month	£148	£196	Heavy users who will lock 24 months

Read the table left to right. Over two years, rolling 310GB at £20 is £480. Pay Monthly Plus 310GB at £100 plus £4 a month is about £196 — roughly £284 less for the same labelled allowance if you accept the 24-month commitment. That is the cash lead for heavy users on this page. The 150GB upfront plan at £180 for 24 months still wins if 150GB is enough and you prefer one payment with no monthly bill after day one.

Want the full Pay Monthly Plus ladder (including smaller allowances)? See Mozillion Pay Monthly Plus SIM deals. Prefer annual upfront maths across brands? Our 12 month SIM only deals UK October 2026 guide sits next door.

Who each rolling rung is for

150GB at £15 is the entry rolling card. Ofcom’s Communications Market Report still puts average mobile data use well below this — so 150GB is already a heavy personal allowance for most adults. It suits people who hotspot a laptop some evenings, stream on the commute, or share a phone as a backup home connection without wanting a 24-month lock. Over a year it costs £180, which matches Mozillion’s 24-month upfront sticker price — except on rolling you have paid monthly and kept the right to leave.

210GB at £16 is a quiet value step: one pound more than 150GB for another 60GB. Take it if last month’s Settings screen sat around 140–180GB and you want headroom without jumping to the top of the ladder.

260GB at £17 is the sweet spot for many “big data” shoppers who still want rolling flexibility. Two pounds above the 150GB card buys 110GB more. Over 12 months that is £204; over 24 months £408. If you will stay two years and need 300GB-class data, Pay Monthly Plus still beats this on cash — but 260GB rolling wins if you refuse a lock.

310GB at £20 is the climax of the rolling ladder. We are stating the price clearly: it is £20 a month, not £15. Fifty gigabytes more than 260GB costs £3 more each month (£36 a year). Only buy it if you regularly clear 260GB, or you want maximum rolling headroom and accept the £240 year / £480 two-year cash.

Rolling vs upfront: the decision in plain English

Choose rolling when coverage is unproven, you might move house, you are waiting on a handset unlock, or you simply hate long contracts. The price of that freedom on Mozillion’s big-data rungs is a higher full-term total than the locked alternatives.

Choose the £180 24-month 150GB upfront plan when 150GB is enough and you are happy to pay the term on day one. Effective rate about £7.50 a month if you stay the full 24 months — and the two-year total stays £180, half of rolling 150GB’s £360.

Choose Pay Monthly Plus 310GB when you need the big allowance and will stay 24 months. Year-1 cash about £148 and 24-month total about £196 beat every rolling rung on this page for 310GB-class data. Credit and eligibility checks may apply on Pay Monthly Plus — confirm on Mozillion’s order journey before you treat it like a no-check rolling SIM.

Network, eSIM and what to check before you port

Mozillion runs on EE masts. That is the point of shopping this brand if EE already works in your kitchen and on your commute. If Three or Vodafone is the mast that actually works at home, a cheaper Three MVNO will still feel faster than a “better” Mozillion plan on a weak EE signal. Check EE’s coverage map for home, work and any regular travel route before you port.

Most modern phones take a nano SIM or eSIM. Confirm eSIM availability on the plan journey if your handset is eSIM-only. Keep your number with a PAC (or the Text to Switch path where it applies). Start the port from Mozillion after the new SIM is active — do not cancel the old network first.

Students comparing big allowances across brands can also skim student SIM only deals UK October 2026 for the wider mid-to-heavy field.

How we ranked these (and what we refuse to do)

We open Mozillion’s listed plans, take the monthly pound or upfront fee printed there, and multiply by twelve or twenty-four. We sort by that cash. We do not invent a cheaper 310GB rolling price. We do not hide the £20 top rung behind a “from £15” headline. We do not treat a comparison tile as the shop price.

We refuse to:

• mark a live Mozillion plan as unavailable when the shop still sells it
• pretend 260GB and 310GB cost the same
• rank Pay Monthly Plus as “no commitment” when it is a 24-month path
• publish a separate thin 300GB page that cannibalises this ladder

Affiliate links do not move a row in the table. If Mozillion’s own site shows a different pound tomorrow, the shop wins — re-check before you pay.

FAQ

What is the cheapest Mozillion rolling SIM for big data right now?

As of 7 October 2026, the rolling ladder starts at 150GB for £15 a month. That is the lowest monthly rolling price on this page. If you need more data without locking a term, 260GB for £17 is usually better value than jumping straight to 310GB.

Is there a Mozillion 260GB SIM only deal?

Yes. Mozillion lists a 260GB 1-month rolling SIM at £17 a month when we checked on 7 October 2026. Over twelve months that is £204; over twenty-four months £408. It sits between the 210GB £16 and 310GB £20 rolling rungs.

How much is Mozillion 310GB rolling?

£20 a month on a 1-month rolling plan — not £15. Year-1 cash is £240; a full 24 months is £480. If you want 310GB for less over two years and will commit, Pay Monthly Plus at £100 upfront plus £4 a month is about £196 over 24 months.

Is Mozillion rolling better than the £180 upfront plan?

Rolling is better if you need flexibility. The £180 24-month 150GB plan is better cash if 150GB is enough and you will stay two years — you pay £180 once instead of £360 over 24 months on rolling 150GB. Different products for different risk tolerances.

Does Mozillion need a credit check on rolling SIMs?

Mozillion’s 1-month rolling big-data SIMs are sold without a credit check on the journey we checked. Pay Monthly Plus is a different product and can involve credit or eligibility checks — read the checkout for that plan before you order.

Which network does Mozillion use?

Mozillion uses the EE network. Check EE coverage at home and work before you switch. A large data allowance on a weak mast still feels slow indoors.

Can I keep my phone number?

Yes. Request a PAC from your current provider (or use Text to Switch where available), then start the port with Mozillion once your new SIM is active. Do not cancel the old contract until the number has moved.

Should I buy 260GB or 310GB rolling?

Buy 260GB at £17 if your last few months sat under about 250GB. Buy 310GB at £20 only if you regularly clear 260GB or you want maximum rolling headroom and accept the higher year cash. For locked 310GB cash, compare Pay Monthly Plus first.

Check the top rolling rung before you pay

If you want maximum Mozillion data without a long contract, the rolling climax on 7 October 2026 is 310GB for £20 a month. Confirm the pound, the allowance and EE coverage on the retailer page. If you would rather cut the two-year bill and will stay, use the Pay Monthly Plus button above instead.

Switch Squid Ltd, company number 13332631, Leamington Spa.