Last updated: Thursday 10 September 2026 (Europe/London).
Next update: when iD reprints the 10GB £6 / £7 tiles, when Mozillion changes the cash 10GB ladder, when SMARTY puts a non-legacy labelled 10GB back on the live shop ladder, or when Talkmobile / Lebara / spusu print an exact 10GB SKU on their own sites.
By: Switch Editorial Team, Switch Squid Ltd
I am Switch. I compare SIMs for a living, and 10GB SIM only deals UK in September 2026 is the awkward rung just under Ofcom’s average — the one comparison sites love to pad with 8GB, 12GB and 15GB cards on the same “about 10GB” filter.
As of 10 September 2026, the 12-month cash lead on an exact labelled 10GB plan is iD Mobile’s 24-month 10GB at £6.00 on idmobile.co.uk/sim-only-deals — twelve months £72.00, unlimited UK minutes and texts, Three masts. The catch is the 24-month lock and a pay-monthly credit check. If you want the same allowance without the lock, iD’s rolling 1-month 10GB at £7.00 is £84.00 for the year on the same shop page.
uSwitch still routes “SIM only” shoppers through a compare table rather than a dedicated 10GB guide URL. Fine for browsing. Useless if the card is a comparison exclusive the retailer’s own site does not sell. This page stays on one tier: exact labelled ~10GB, priced from retailer shops on Thursday 10 September 2026.
Our SIM only hub is every network and every allowance, ranked by total monthly cost. This URL stays on 10GB.
Ofcom’s Communications Market Report 2026 puts average monthly data per mobile data user at 11.8GB in 2025 (CMR 2026 PDF). So 10GB sits just under average — light-mid, not the 5GB light bucket and not the commute-streamer 30GB shop. If last month was under 6GB, start with 5GB. If it was 14GB-plus with a week still to go, use 15GB, 20GB or 30GB.
I will not invent a 10GB SKU. I will not rank a uSwitch tile the retailer’s own site does not sell. Every pound in the ranking table below is dated to a retailer page I am standing behind on 10 September 2026.
Filter 10GB on the hub
Open the SIM only hub. Set data around 10GB, pick 30-day or 12-month, sort by total monthly cost. Commission does not move a row. If an 8GB or 15GB card is sitting on a “10GB” filter, you filtered wrong — or the live feed mixed a neighbour tier.
Need a new handset instead of airtime? That is a different bill: compare phone deals or phone deals hub.
Already sure you want a thinner or fatter cap? Neighbour guides are 5GB SIM only deals UK, 15GB, 20GB, 30GB, 40GB, 50GB, 80GB, 100GB, and cheapest unlimited. This URL stays on 10GB.
Keep the handset, switch the SIM — 10GB is about the airtime bill, not a new phone.
What I verified today
Five retailer-verified exact-labelled 10GB plans. Dated Thursday 10 September 2026. Near-tier cards (8GB, 15GB, 16GB, 20GB) live in the notes, not as fake 10GB rows. Comparison exclusives, legacy API ghosts and unverified shop pounds live in “What I dropped”.
iD Mobile SIM-Only 10GB — 24 Months, idmobile.co.uk/sim-only-deals, fetched 10 September 2026: product name “iD Mobile SIM-Only 10GB 24 Months”, offer price £6.00, unlimited minutes and texts, Three network. Twelve-month cash £72.00 (monthly × 12; no upfront SIM fee printed on the card). This is the cash lead — and it is a 24-month commitment, so only treat it as a win if you will stay on that plan.
iD Mobile SIM-Only 10GB — 1 Month, same shop page, fetched 10 September 2026: “iD Mobile SIM-Only 10GB 1 Month” at £7.00, rolling. Twelve-month cash £84.00. Same allowances, no long lock. This is the flexible lead if you hate contracts.
Mozillion 10GB, mozillion.com/sim/pay-monthly-sim, fetched 10 September 2026: cash prices £7.95 (24 months), £8.50 (12 months), £8.95 (1 month) — unlimited calls and texts, EU roaming on the card copy. Twelve-month cash £95.40 / £102.00 / £107.40. I rank the cash pound only. The shop also waves “or FREE every month” rewards — that is not a guaranteed cash reduction in this table, so it does not move a rank.
What I dropped
Comparison hubs and thin “10GB” round-ups still try to sell these as 10GB. Retailer shops do not match, or I could not verify the pound on the shop today.
- SMARTY SM_10GB at £8 — still in the plans API with
plan_is_legacy: true. The live non-legacy classic ladder I can defend for new customers jumps 8GB (£7) → 16GB (£8). Legacy 10GB is dropped for ranking. - Talkmobile 10GB — talkmobile.co.uk/sim-only-deals shows Flex cards from 15GB at £5.95 upward (30/60/80/100). No labelled 10GB tile today.
- Lebara 10GB — lebara.co.uk PDP model JSON today lists 5 / 20 / 30 / 50 / 100 / Unlimited. No 10GB product page. MSE-style “10GB equivalent” maths that is not on the Lebara shop is dropped.
- spusu 10 — tariffs schema is 5 / 8 exclusive / 15 / 20 / 40 / 70 / 100. No 10GB.
- giffgaff — bot wall from this research host; I will not invent a goodybag pound.
- Three / Vodafone own-shop 10GB SIM SKUs — Three sim-only URL 404 / queue-gated; Vodafone best-SIM page mentions 10GB as a usage tip, not a clean SIM SKU I could extract. Omitted.
- Any uSwitch “10GB from £X” exclusive that does not match a retailer shop page. Dropped per retailer-own-site rule.
If a tile is cheaper than iD’s shop £6.00 24-month 10GB and the retailer’s own site does not print that exact 10GB SKU, the tile is not a deal. It is a trap for people who do not click through.
Ranked by what you actually pay
Four columns. Ongoing rate is what the bill is while the current rate holds. Average is the 12-month total divided by 12. Every row below is retailer-verified labelled 10GB on 10 September 2026.
| Plan (dated 10 Sep 2026) | Term | Ongoing £ / month | 12-month average |
|---|---|---|---|
| iD Mobile 10GB (idmobile.co.uk, unltd mins/texts, Three) | 24 months | £6.00 flat | £6.00 (£72.00 total) |
| iD Mobile 10GB (idmobile.co.uk, unltd mins/texts, Three) | 1 month | £7.00 flat | £7.00 (£84.00 total) |
| Mozillion 10GB (mozillion.com, unltd calls/texts, EU roam; cash only) | 24 months | £7.95 flat | £7.95 (£95.40 total) |
| Mozillion 10GB (cash only) | 12 months | £8.50 flat | £8.50 (£102.00 total) |
| Mozillion 10GB (cash only) | 1 month | £8.95 flat | £8.95 (£107.40 total) |
£6.00 is the iD 24-month month. £72.00 is that year. £7.00 is the iD rolling month. £84.00 is that year. Mozillion’s cheapest cash 10GB year is £95.40 on the 24-month card — still more than iD’s rolling year, before you even open the rewards app.
Over twelve months the gap from iD’s locked £72 lead to Mozillion’s locked £95.40 is £23.40. The gap from iD rolling £84 to Mozillion rolling £107.40 is £23.40 as well. That is the honest same-allowance ladder today. Everything else that looks “about 10GB” is a neighbour with a different label.
£72 is the locked year — £84 is the free exit
If Three coverage works at your postcodes and you will actually stay put for two years, the cheapest retailer-verified exact-10GB year I can print today is iD’s 24-month 10GB at £6 × 12 = £72 on idmobile.co.uk. Read the minimum term before you celebrate.
If you want the same 10GB with a monthly exit, iD’s 1-month 10GB at £7 is £84 for the year — twelve pounds more than the locked card, and still cheaper than Mozillion’s cash 10GB ladder.
Mozillion is the EE-leaning uncapped-5G alternative on this URL if Three is weak where you live. You pay more cash for the year at every term length I verified. That can still be rational — a cheap SIM on a dead mast is 0GB.
10GB sits just under Ofcom’s average
Ofcom’s 2026 CMR figure is 11.8GB average per mobile data user in 2025. A 10GB SIM is a little under that average — fine for maps, social apps, messaging and light commute streaming if you are honest about last month’s usage screen.
Illustrative only, labelled as such: at a rough 3GB per hour for HD streaming, 10GB is about three hours of video a month before everything else eats the rest. If Settings → Mobile Data (iPhone) or the Android data-usage screen showed 6–10GB last month with a week still to go, you are in the right shop. If it showed 3–5GB, you are overpaying for headroom — start on the 5GB guide. If it showed 12–18GB, look at 15GB or 20GB instead.
Ofcom’s average sits just above 10GB — check last month’s data screen before you overbuy.
I am not going to pretend 10GB is “unlimited in disguise”. Heavy hotspotting, a week of 4K, or holiday roaming under a tight fair-use cap will still bite. That is why the fatter September guides exist.
The neighbour traps (not fake 10GB rows)
This is where September shopping goes wrong. Same-ish cash. Wrong allowance. Or a lock you did not ask for.
| Neighbour (not a 10GB row) | Cash note | Why it is not in the table |
|---|---|---|
| SMARTY 8GB £7 (non-legacy API) | £84/year | Labelled 8GB — same cash as iD rolling 10GB, less data |
| SMARTY 16GB £8 (non-legacy API) | £96/year | Labelled 16GB — more data, not this URL |
| spusu 8 exclusive £4.90 / spusu 15 £6.90 | £58.80 / £82.80 | 8GB and 15GB — EE ladder with no 10GB rung |
| Talkmobile Flex 15GB £5.95 | £71.40/year | 15GB — often cheaper cash than locked iD 10GB for more data |
| Lebara 5GB £5 / 20GB £9–£10 | £60 / £108–£120 | No 10GB PDP on lebara.co.uk today |
Read that carefully. Talkmobile’s 15GB at £5.95 can print a cheaper year (£71.40) than iD’s locked 10GB (£72) with more data and a rolling Flex term. That is not a 10GB row, so it stays out of the ranking table — but if your usage already kisses 12GB, stop romanticising the 10GB URL and open the 15GB September guide.
SMARTY’s live ladder skipping 10GB is the other trap. An old “SMARTY 10GB £7/£8” memory from a comparison blog is not a shop card I can defend on 10 September 2026 for new customers.
You are buying a mast, not a logo
10GB on a dead mast is 0GB. The four UK networks still sit under the MVNO names.
| If you want this mast | 10GB plan I named today | Parent | Check before you pay |
|---|---|---|---|
| Three | iD Mobile 10GB £6 (24m) / £7 (1m) | Three | Indoor signal at home and work; credit check on pay-monthly |
| EE-leaning uncapped 5G | Mozillion 10GB cash £7.95–£8.95 | Mozillion shop claim | Coverage where you actually live; ignore FREE-rewards framing for cash rank |
| Vodafone | No exact labelled 10GB shop row today — Talkmobile starts at 15GB | Vodafone | See 15GB if Vodafone is your mast |
| EE (spusu) | No exact 10GB — spusu 8 / 15 neighbours | EE | Pick 8GB or 15GB on spusu.co.uk/tariffs, not a fake 10 |
Run a coverage check for the postcodes that matter — home, commute, parents’ house — before you lock twenty-four months for a three-pound saving.
How I calculate the year
Simple on purpose. 12-month cash = (monthly rate × 12) + any upfront SIM fee. None of the ranked rows printed an upfront SIM fee today. Intro discounts would be averaged across twelve months if a shop card had one — none of these five did.
I do not subtract cashback I have not verified on the retailer page. I do not treat Mozillion rewards as negative pounds. I do not annualise a comparison-site “equivalent monthly” that the shop does not sell.
Switching without the drama
Text PAC to 65075 on your old SIM. Keep the code for checkout. Most of these shops let you enter it so the number moves when the new SIM activates. eSIM is usually faster if your phone supports it — check the retailer’s eSIM steps at order.
If you are mid-contract elsewhere, check early-termination fees before you chase a £12 annual saving. A cheap 10GB year is not cheap if you still owe six months on the old plan.
FAQ
What is the cheapest 10GB SIM only deal in the UK right now?
As of 10 September 2026, the lowest 12-month cash total on an exact labelled 10GB plan I verified on a retailer shop is iD Mobile’s 24-month 10GB at £6.00 — £72.00 for the year — on idmobile.co.uk/sim-only-deals. The catch is the 24-month minimum term and a credit check.
What if I do not want a 24-month contract?
Take iD Mobile’s 1-month 10GB at £7.00 on the same shop page. Twelve months is £84.00. Still cheaper cash than Mozillion’s rolling 10GB at £8.95 (£107.40/year) on mozillion.com.
Is SMARTY still selling a 10GB plan?
Not as a clean new-customer classic plan I can defend today. The plans API still lists SM_10GB at £8 with plan_is_legacy: true, while the non-legacy ladder jumps from 8GB (£7) to 16GB (£8). I dropped legacy 10GB from the ranking.
Why is Talkmobile’s 15GB cheaper than some 10GB deals?
Because Talkmobile’s own Flex ladder starts at 15GB for £5.95 (£71.40/year) and does not print a 10GB card today. More data for less cash is a neighbour win — it is not a 10GB row on this URL.
Does Lebara still do a 10GB SIM?
Not on the lebara.co.uk product pages I fetched on 10 September 2026. The live PDP set is 5GB, 20GB, 30GB, 50GB, 100GB and Unlimited. If a comparison site shows a Lebara 10GB teaser, click through — if the shop does not match, walk away.
Is 10GB enough in 2026?
Ofcom’s CMR 2026 average is 11.8GB per mobile data user in 2025, so 10GB is slightly under average. It is enough if your last full month was under about 10GB with Wi-Fi at home. It is tight if you stream video on the commute every day.
Do these plans include unlimited calls and texts?
The five ranked rows — both iD 10GB terms and all three Mozillion 10GB terms — showed unlimited UK minutes and texts on the shop cards checked on 10 September 2026. Always re-read the card at checkout; promos change.
Should I take Mozillion’s “FREE every month” offer instead of the cash price?
Only if you understand the rewards mechanics and still want that network. For this ranking I use the printed cash pound (£7.95 / £8.50 / £8.95). Rewards are not a guaranteed reduction in the 12-month cash column.
Bottom line
Exact 10GB SIM only deals UK are thinner than the 15GB and 20GB shops in September 2026. The cash lead is iD Mobile 10GB 24 Months at £6.00 — £72.00 for twelve months — with a real lock. The flexible lead is iD Mobile 10GB 1 Month at £7.00 — £84.00. Mozillion fills the uncapped-5G gap at higher cash. Neighbours like Talkmobile 15GB at £5.95 can beat the locked 10GB year on both price and allowance — so check your usage screen before you force a 10GB label.
When you are ready to compare live cards across networks, open the SIM only hub and sort by total monthly cost. Come back to this URL when you need the dated 10GB cash ladder, not a filter full of 8GB and 15GB impostors.
