Last updated: Wednesday 9 September 2026 (Europe/London).
Next update: when Talkmobile changes the Flex 80GB £8.95 rate, when iD reprints the 80GB pound on idmobile.co.uk/sim-only-deals, when SMARTY finally prints a clean labelled 80GB price I can defend, or when the live SIM hub shows a cheaper same-allowance 12-month total on a retailer page I can open.
By: Switch Editorial Team, Switch Squid Ltd
I am Switch. I compare SIMs for a living, and 80GB SIM only deals UK in September 2026 is the heavy-but-not-unlimited rung comparison sites answer with a filter on a generic hub — or with a “big data” grid that quietly mixes 60GB, 100GB and social-unlimited plans on the same page.
uSwitch has no dedicated 80GB guide URL I want to copy. You land on the SIM-only compare table, tick a box, and hope the card still means 80GB by checkout. This page is one tier: exact labelled ~80GB, priced from retailer shops on Wednesday 9 September 2026.
Our SIM only hub is every network and every allowance, ranked by total monthly cost. This URL stays on 80GB.
The cash lead this morning is Talkmobile Flex 80GB at £8.95 rolling on talkmobile.co.uk/sim-only-deals (SKU flex-80gb-9) — twelve months £107.40, unlimited UK minutes and texts, Vodafone masts, 5G where available. One rung behind on Three masts is iD Mobile 80GB at £10 on idmobile.co.uk/sim-only-deals — twelve months £120.00 on both the 1-month and 12-month shop cards I verified today.
Ofcom’s Communications Market Report 2026 puts average monthly data per mobile data user at 11.8GB in 2025 (CMR 2026 PDF). So 80GB sits well above average — hotspot weeks, commute streaming, tablet tethering — not the mid 30–50GB shop. If last month was under 40GB, start with 50GB or 40GB. If you are already bumping a soft cap every month, use 100GB or cheapest unlimited.
I will not invent an 80GB 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 9 September 2026.
Filter 80GB on the hub
Open the SIM only hub. Set data around 80GB, pick 30-day or 12-month, sort by total monthly cost. Commission does not move a row. If a 60GB or 100GB card is sitting on an “80GB” 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 15GB, 30GB, 40GB, 50GB, 100GB, and cheapest unlimited. This URL stays on 80GB.
Keep the handset, switch the SIM — 80GB is about the airtime bill, not a new phone.
What I verified today
Two retailer-verified exact-labelled ~80GB plan families. Dated Wednesday 9 September 2026. Near-tier cards (60GB, 70GB, 90GB, 100GB, social-unlimited) live in the notes, not as fake 80GB rows. Comparison exclusives and unverified shop pounds live in “What I dropped”.
Talkmobile Flex 80GB, talkmobile.co.uk/sim-only-deals, fetched 9 September 2026: SKU flex-80gb-9, £8.95 a month, 30-day contract, 80GB data, unlimited UK minutes and texts. Vodafone masts. 5G where available. EU roam fair-use on shop copy — confirm the FUP at checkout before you treat a week in Spain like home data. Twelve-month total £107.40, average £8.95. This is the cash lead for unlimited UK calls at exact 80GB.
iD Mobile SIM-Only 80GB, idmobile.co.uk/sim-only-deals (JSON-LD ItemList + deal blobs), fetched 9 September 2026: £10.00 a month on both the 1 Month and 12 Months labelled 80GB cards (deal id 143849578 / 137985540). Unlimited minutes and texts. Three UK 4G/5G. No annual price rises printed on the plan schema. Data rollover and EU roaming in 50 destinations on the shop copy. Twelve-month total £120.00, average £10.00. Twelve pounds sixty more than Talkmobile for the year — and Three coverage if that is the mast that works at your postcode.
What I dropped
Comparison hubs and thin “80GB” round-ups still try to sell these as plain 80GB. Retailer shops do not match, or I could not verify the pound on the shop today.
- SMARTY 80GB — hotukdeals and third-party posts still shout £8, but I could not find a clean labelled 80GB card on smarty.co.uk on 9 September 2026. Omitted. I will not invent a SMARTY figure.
- VOXI “Unltd Social … 80GB” — real shop products at £10 on voxi.co.uk, but they bundle unlimited social/music/video categories plus an 80GB bucket. That is not a plain 80GB SIM row. See neighbour notes.
- Lebara / Lyca / giffgaff / O2 shop floors — no clean own-site labelled 80GB pound I could defend from today’s fetch. Dropped.
- Any uSwitch “80GB from £X” exclusive that does not match shop SKU / JSON-LD. Dropped per retailer-own-site rule.
- spusu 70 — real EE-mast plan at £12.90 on spusu.co.uk/plans. Wrong allowance for this table.
If a tile is cheaper than Talkmobile’s shop £8.95 and the retailer’s own site does not print that exact 80GB 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 ~80GB on 9 September 2026.
| Plan (dated 9 Sep 2026) | Term | Ongoing £ / month | 12-month average |
|---|---|---|---|
| Talkmobile Flex 80GB (talkmobile.co.uk, unltd mins/texts, Vodafone, SKU flex-80gb-9) | 30-day | £8.95 flat | £8.95 (£107.40 total) |
| iD Mobile 80GB 1 Month (idmobile.co.uk, unltd mins/texts, Three, no APR) | 1 month | £10.00 flat | £10.00 (£120.00 total) |
| iD Mobile 80GB 12 Months (same shop, deal 137985540) | 12 months | £10.00 flat | £10.00 (£120.00 total) |
£8.95 is the Talkmobile month. £107.40 is that year. £10.00 is the iD month. £120.00 is that year.
Over twelve months Talkmobile is £107.40. iD 80GB is £120.00 — £12.60 more for Three masts and the shop’s no-annual-rise line. That is the honest ladder at exact 80GB this morning.
£8.95 is the unlimited-calls year
If Vodafone coverage works at your postcodes and you want unlimited UK calls and texts on a rolling 80GB SIM, the cheapest retailer-verified year I can print today is Talkmobile Flex 80GB at £8.95 × 12 = £107.40 on talkmobile.co.uk. No 24-month lock on that Flex SKU.
If you want Three coverage, iD 80GB at £10 is £120 for the year on idmobile.co.uk/sim-only-deals — twelve pounds sixty more than Talkmobile. The 1-month and 12-month 80GB cards print the same pound today, so the lock only matters if you want the term, not the cash.
There is no third exact-80GB national shop row I can defend this morning without dressing a social plan or a 70/90 neighbour as 80. That is not me being lazy. The mid-heavy tier is thin: Talkmobile prints Flex 80, iD prints 80, and SMARTY’s own 80GB pound stayed unverified.
80GB sits far above Ofcom’s average
Ofcom’s 2026 CMR figure is 11.8GB average per mobile data user in 2025. An 80GB SIM is a heavy-use rung — hotspotting a laptop on the train, a week of video calls on mobile data, kids’ tablets tethered to your phone.
Illustrative only, labelled as such: at a rough 3GB per hour for HD streaming, 80GB is about twenty-six hours of video a month before everything else eats the rest. If Settings → Mobile Data (iPhone) or the Android data-usage screen showed 45–70GB last month with a week still to go, you are in the right shop. If it showed 20–35GB, you are overpaying for headroom — start on the 50GB guide. If it showed 90GB-plus, look at 100GB or unlimited instead.
80GB sits well above Ofcom’s average — check last month’s data screen before you overbuy.
I am not going to pretend 80GB is “unlimited in disguise”. Heavy 4K hotspotting 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 80GB rows)
This is where September shopping goes wrong. Same-ish cash. Wrong allowance. Or a social unlimited dressed as plain data.
| Neighbour (not an 80GB row) | What the shop prints | 12-month cash | Why it is not in the table |
|---|---|---|---|
| Talkmobile Flex 60GB (SKU flex-60gb-8) | £7.95 / 30-day / Vodafone | £95.40 | 60GB label |
| Talkmobile Flex 100GB (SKU flex-100gb-10) | £9.95 / 30-day / Vodafone | £119.40 | 100GB label — and only £12 more than Flex 80 for the year |
| spusu 70 (spusu.co.uk/plans) | £12.90 rolling / EE | £154.80 | 70GB + dearer than iD 80 |
| iD 90GB 12 Months | £10.00 / Three | £120.00 | 90GB label — same cash as iD 80 |
| VOXI Unltd Social 80GB plans | £10.00 / Vodafone | £120.00 | Social/music/video unlimited + 80GB bucket |
Notice Talkmobile Flex 100GB at £9.95 is only a pound a month above Flex 80 — £119.40 for the year versus £107.40. If you are already brushing 70GB, paying twelve pounds more for the year to jump to 100GB can be the calmer bill. That decision lives on the 100GB guide, not as a fake 80GB row here.
Rolling vs 12-month at the same £10
On iD today the 1-month and 12-month 80GB cards both print £10. The lock does not buy a cheaper month. Take the 12-month only if you want the term and the shop’s other lock benefits — not because it wins the cash rank.
Talkmobile’s Flex 80 stays 30-day. That is the flexibility story: leave when coverage disappoints, or when a verified neighbour undercuts £8.95 on a page I can open.
How to buy without getting bounced
1. Check mast coverage at home and work (Vodafone for Talkmobile, Three for iD) before you fall in love with a pound.
2. Open the retailer shop URL in the table — not a comparison tile.
3. Confirm the allowance still says 80GB at checkout.
4. Keep your number with a PAC if you are switching — see how to get a PAC code.
5. Prefer eSIM if your handset supports it — eSIM vs physical SIM.
Then come back to the SIM only hub when you want every allowance on one screen.
FAQ
Is 80GB enough data?
For most people, yes — and then some. Ofcom’s average is about 11.8GB. 80GB is for heavy hotspotting and commute streaming. Check last month’s usage screen before you buy.
What is the cheapest 80GB SIM only deal UK right now?
On retailer shops I opened on 9 September 2026: Talkmobile Flex 80GB at £8.95 (£107.40 / year). iD Mobile 80GB at £10 (£120 / year) is the Three-mast alternative.
Should I take iD’s 1-month or 12-month 80GB?
Same £10 month today. Cash is identical over twelve months. Choose the term for flexibility or lock preference, not for a discount that is not there.
Why is VOXI missing from the main table?
VOXI’s £10 “80GB” cards are social/music/video unlimited plans with an 80GB general bucket. Useful for some people — not a plain 80GB SIM row.
Where do I compare every SIM, not just 80GB?
On our SIM only deals hub. Filter by data and sort by total monthly cost.
I will refresh this page when Talkmobile, iD, or another retailer shop prints a cheaper verified exact-80GB year. Until then: £8.95 Talkmobile Flex 80GB leads the cash rank, £10 iD leads on Three masts, and everything else that looks “about 80GB” belongs in the neighbour notes — not in the table.
Compare live SIM only deals on the hub when you are ready to filter past this one tier.
