Last updated: Tuesday 6 October 2026 (Europe/London) — Mozillion rolling prices added; iD and SMARTY prices as checked on 13 September 2026.
Next update: when iD, SMARTY or Talkmobile reprint a labelled 200GB own-shop price I can re-verify.
By: Switch Editorial Team, Switch Squid Ltd
O2 update (1 Oct 2026): Classic 30-day / rolling SIMs are back for October — 10GB at £7 up to 250GB at £15, with Priority, EU roaming up to 25GB, and double data for Virgin Media customers. October O2 30-day ladder guide →
Already with Vodafone? Mobiles.co.uk has a Vodafone 200GB upgrade SIM only for existing Vodafone customers at an effective £5 a month, and Vodafone 120GB SIM only works out at £5.25 a month effective for new customers. See our Vodafone SIM only deals guide.
New on 6 October 2026: Mozillion has launched 1-month rolling big-data SIMs on the EE network: 150GB for £15 a month, 210GB for £16, 260GB for £17 and 310GB for £20. Each has unlimited UK calls and texts, uncapped 5G and EU roaming in 41 countries, and Mozillion says there is no credit check and no mid-contract price rise. If you want a little more than 200GB and EE coverage suits you, 210GB at £16 a month is £192 over 12 months, with nothing extra to pay upfront.
Mozillion 210GB 1-month rolling SIM — £16 a month
- 210GB a month with unlimited UK calls and texts, uncapped 5G and EU roaming in 41 countries
- £16 a month on a 1-month rolling plan — £192 over 12 months, nothing extra to pay upfront
- Main limitation: 210GB is a little more than 200GB, and coverage depends on the EE network where you are
Affiliate link: we may earn a commission if you buy. It does not change your price.
As of 13 September 2026, the cheapest labelled 200GB SIM-only plan I can verify on a retailer’s own shop is iD Mobile’s SIM-Only 200GB 12 Months at £7 for three months then £14 — £147 over 12 months on Three’s mast, with the half-price window dated to 6 October 2026 on the deal payload. Next is iD’s 200GB 1 Month at the ItemList Offer price of £14.00 (£168/year). SMARTY Classic SM_200GB sits at £17.00 rolling (£204/year). Talkmobile’s own shop tops out at a labelled 150GB tier today — there is no 200GB SKU I can rank without inventing one.
I rank by 12-month cash from retailer own shops only, not by comparison-site exclusives. That means idmobile.co.uk and smarty.co.uk today — and it means dropping MyMobiles tiles that print a £12 “5G SIM Only 200GB” or Talkmobile £13.95 when talkmobile.co.uk itself does not show 200GB. Compare other allowances on the SwitchSquid SIM-only comparison pages.
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How I ranked 200GB today
Rules for this Day 1 sprint URL (exact slug 200gb-sim-only-deals-uk):
Exact 200GB labelled allowance on the retailer’s own site, public plan API, or ItemList JSON-LD.
12-month cash = monthly × 12 for rolling plans, or the contracted first-year total when a promo prints both the intro and the ongoing price.
Network mast noted (Three / EE / Vodafone / O2) because coverage is the product.
Drop comparison exclusives, neighbouring allowances (150GB / unlimited), and promos I could not open on the retailer’s own site.
That last point is the whole game at 200GB. Heavy-data searchers get flooded with “from £12” tiles that resolve to a third-party exclusive, a different allowance, or a plan the retailer’s own HTML never prints. SwitchSquid policy: if I cannot open the labelled 200GB price on the brand’s domain, it stays out of the ranking table.
200GB ranking table (13 Sep 2026)
Rank | Deal (own shop) | £/mo structure | 12-month cash |
|---|---|---|---|
1 | iD Mobile SIM-Only 200GB 12 Months (Three) | £7 × 3, then £14 × 9 | £147.00 |
2 | iD Mobile SIM-Only 200GB 1 Month (Three) | £14.00 rolling (ItemList) | £168.00 |
3 | Mozillion 210GB 1 Month (EE) — added 6 October 2026 | £16.00 rolling | £192.00 |
4 | SMARTY Classic 200GB rolling (Three) | £17.00 | £204.00 |
Mozillion 210GB 1-month rolling SIM — £16 a month
- 210GB a month with unlimited UK calls and texts, uncapped 5G and EU roaming in 41 countries
- £16 a month on a 1-month rolling plan — £192 over 12 months, nothing extra to pay upfront
- On 12-month cash it sits between iD’s rolling 200GB (£168 when checked in September) and SMARTY’s £204
Sources dated Sunday 13 September 2026: iD deal_id 144669774 (12-month, monthly_cost 14.00, hplr_value 7 for 3 months, hplr_expire_date 2026-10-06) and ItemList “iD Mobile SIM-Only 200GB 12 Months”; ItemList “iD Mobile SIM-Only 200GB 1 Month” Offer price £14.00 (deal payload 132221876 also prints monthly_cost 12.00 — I keep £14 in the table until iD’s plan card and ItemList agree on £12); SMARTY public API plan id SM_200GB at price 1700 pence, plan_is_indirect_retail_only: false, Classic ladder, smarty.co.uk/plans/200gb-data.
Why iD’s 12-month 200GB wins on cash
Three months at £7 is £21. Nine months at £14 is £126. Together that is £147 for a labelled 200GB year on Three — £21 cheaper than paying the ItemList £14 rolling price for twelve months, and £57 cheaper than a year of SMARTY Classic 200GB at £17. You do commit to 12 months: read the minimum term and any early exit fees on the iD checkout before you treat £147 as a rolling number. The half-price window is dated — the deal payload expires the hplr flag on 6 October 2026 — so if you are reading this after that date, re-open idmobile.co.uk before you buy.
iD runs on Three. If Three is weak at your postcode, the “cheapest” 200GB SIM is the wrong SIM. Run Ofcom’s coverage checker or the Three map for home and commute before you port. Bill capping, data rollover wording and EU roaming sit in iD’s own plan description — useful extras, not a reason to ignore a dead zone in the kitchen.
iD 200GB rolling — ItemList £14, payload tension
The public ItemList on idmobile.co.uk/sim-only-deals names “iD Mobile SIM-Only 200GB 1 Month” with an Offer price of £14.00 and “No annual price rises” in the description. Separately, an on-page deal payload for deal_id 132221876 prints monthly_cost: 12.00 for 200000 MB on a 1-month term. I will not invent a reconciliation. For the ranking table I use the ItemList Offer price of £14 (£168/year) because that is the structured public offer. If iD’s checkout clearly shows £12, use £12 — and tell us, because that would move rolling iD ahead of the 12-month cash lead. Until ItemList and the visible card agree, £14 is the honest published figure.
SMARTY Classic 200GB — £17 and transparent
SMARTY’s public plans API exposes SM_200GB at £17.00 (1700 pence) with unlimited voice and text on Three, Classic category, not flagged as indirect-retail-only. The marketing page at smarty.co.uk/plans/200gb-data matches: “200GB data SIM plan for only £17 p/m”. Twelve months at £17 is £204. SMARTY’s pitch is the usual one: one-month rolling, no credit check, cancel anytime, EU roaming with a published fair-use data cap (12GB on the plan copy I fetched). If you already live in the SMARTY app and Three coverage is fine, the £57/year gap versus iD’s 12-month promo is the price of staying rolling and skipping a minimum term.
What I dropped on purpose
Talkmobile 200GB ~£13.95 — MyMobiles still lists it; talkmobile.co.uk’s labelled SIM-only set I fetched today tops out at 150GB on 12-month and 100GB on 30-day Flex. No 200GB form = no rank.
Anonymous “£12 5G SIM Only 200GB” comparison tiles — without a brand domain I can open, they are marketing, not cash.
Lebara / spusu / giffgaff 200GB — no labelled 200GB own-shop SKU in the HTML I could verify today.
Unlimited neighbours — different keyword. Use the SIM hub rather than stuffing unlimited into a 200GB table.
Is 200GB the right allowance in 2026?
200GB is a hotspot-and-stream tier, not a light social plan. Ofcom’s communications-market figures still put typical smartphone-only use well below this for many people — but households that tether a laptop on the train, share a phone as a temporary home pipe, or burn video all day will chew past 100GB. A clean rule of thumb from bill history:
Under ~80GB/month on your last three bills — you may be overselling yourself; check 100GB pages on the hub.
80–150GB — 200GB is comfortable headroom without jumping to unlimited.
Hotspotting as primary home broadband — still prefer a fixed full-fibre quote where Hyperoptic, Community Fibre or Openreach FTTP is available; mobile is a backup, not a mortgage on latency.
Unlimited minutes and texts are table stakes on all three ranked plans. Roaming allowances differ — confirm iD’s destination list and SMARTY’s 12GB EU fair use before a long trip.
eSIM vs plastic for a heavy-data switch
iD and SMARTY both offer eSIM on supported handsets. For a 200GB plan you are more likely to care about activation speed and keeping a travel SIM in the physical tray. Number porting still uses a PAC either way — do not cancel the old network until the new SIM is live and data is flowing.
April rises and “no annual price rise” claims
iD markets no annual price rises on named SIM-only plans in the ItemList copy. That is different from a fixed broadband contract that prints a £4 April bump. For rolling SMARTY, the protection is simpler — leave if next month’s price is wrong. Read the checkout price-rise clause anyway: “no RPI mid-contract rise” is not the same as “this ladder never changes when you renew.”
How to buy 200GB without getting stung
Open the retailer’s own URL in a private window so comparison overlays do not rewrite the price.
Confirm the allowance says 200GB, not unlimited or 150GB.
Note mast (Three for both ranked brands today) and check coverage at home and work.
If 12-month, diary the half-price end date and read exit fees; if rolling, diary a 30-day review.
Port with a PAC if you are keeping your number.
When you want the wider market — 100GB, unlimited, family multis — use the SwitchSquid SIM-only comparison pages rather than stretching this 200GB page.
Mozillion 210GB 1-month rolling SIM — £16 a month
- 210GB a month with unlimited UK calls and texts, uncapped 5G and EU roaming in 41 countries
- £16 a month on a 1-month rolling plan — £192 over 12 months, nothing extra to pay upfront
- Good fit: you want more than 200GB on EE and the option to leave at the end of any month
FAQ
What is the cheapest 200GB SIM only deal in the UK on 13 September 2026?
Among retailer own-shop prices I verified today, iD Mobile’s 200GB 12-month plan at £7 for three months then £14 (£147/year) is the lowest labelled 200GB cash total.
Is Talkmobile still offering 200GB for about £13.95?
I could not verify a labelled 200GB Talkmobile plan on talkmobile.co.uk today — the visible set tops out at 150GB on 12-month contracts. Treat competitor 200GB Talkmobile claims as unverified until the shop prints it.
Is iD’s rolling 200GB £12 or £14?
ItemList Offer price is £14.00. A deal payload prints monthly_cost 12.00. The ranking table uses £14 until iD’s visible plan card and ItemList agree on £12.
Does SMARTY 200GB have a contract?
Classic SM_200GB is a rolling plan at £17.00 on the public API. You can usually leave after the billed month — confirm in the SMARTY checkout.
Three coverage — should I still buy?
Only if Three works where you actually use the phone. Cash is pointless on a mast that drops calls at home.
Should I take the 12-month iD promo or SMARTY rolling?
Take iD 12-month if you want the £147 cash lead and you are happy locked in until the term ends. Take SMARTY if you may move networks within the year and will accept £204.
Is there a rolling SIM with more than 200GB?
Yes. On 6 October 2026 Mozillion lists 210GB for £16 a month, 260GB for £17 and 310GB for £20 on 1-month rolling plans on the EE network, with unlimited UK calls and texts and nothing extra to pay upfront.
Can I keep my number on a 200GB switch?
Yes — request a PAC from your current network and enter it during iD or SMARTY checkout. Keep the old SIM active until the port completes.
Where do I compare more SIM-only deals?
Use the SwitchSquid SIM-only comparison pages for other allowances. This page stays honest to labelled 200GB only.
