Answer first: Yes — O2 is removing its 30-day / rolling monthly SIM Only (SIMO) tariffs from the affiliate catalogue. The hard stop is 16 September 2026 at 23:59 UK. After that, new customers should not expect the old Classic 30-day ladder (including the familiar 10GB/£7–250GB/£15 style rolling tiles) to stay buyable via affiliate. 12-month O2 SIMs stay live, and flexible MVNOs such as iD Mobile and giffgaff remain the practical rolling alternatives we can track today — including giffgaff Unlimited at £14/mo (18 months) or £20 rolling (was £25/£35), promo ending 2 October 2026 23:59 per help.giffgaff.com.
Get O2 Classic 50GB 12 months — £8/mo →
Get iD Mobile 50GB rolling — £7/mo →
Get giffgaff 40GB — £8/mo →
Get giffgaff Unlimited rolling — £20/mo →
Last updated: Tuesday 15 September 2026 (Europe/London). Source: O2 Mobiles Awin mid 3235 programme notice (30D SIMO removal). Prices below are Nest live affiliate products (aff 911601) checked the same day — including giffgaff Unlimited promo (£14/£20 to 2 Oct 2026 23:59 per help.giffgaff.com). Always confirm at checkout.
What is ending on 16 September 2026?
O2’s affiliate feed is withdrawing all 30-day SIM Only propositions. That includes Standard 30-day SIMO and Classic / Mini-style 1-month contract SIMs that renewed monthly. SwitchSquid has already soft-delisted those Nest products so dead 30-day O2 tiles cannot convert. The deadline in the merchant email is explicit: expire 16/09/2026 23:59.
What is not ending: 12-month O2 SIM Only Classic plans (still live in Nest with Awin pclick tracking, merchant 3235). If you want to stay on the O2 radio network without hunting a dying rolling tariff, the honest path is a live 12-month O2 SIM — not a hub-only “browse SIMs” button.
Related hubs and filters you may already be on: SIM only deals UK, O2 SIM only deals, 1-month SIM only, and compare 1-month SIM only.
What happens after 16 Sep if you wanted O2 rolling?
- New affiliate sales of O2 30-day / 1-month SIMO should stop. Do not trust old comparison blogs that still print the Classic rolling ladder as “live”.
- Existing O2 customers keep whatever contract they already bought under O2’s own terms — this notice is about the affiliate catalogue for new acquisitions, not a forced mid-contract cut for every retail customer.
- If you need monthly exit freedom after the deadline, plan on an MVNO with a live rolling SIM (iD on Three, giffgaff on EE’s consumer stack, etc.) rather than waiting for O2 30-day tiles to reappear.
- If you specifically need the O2 mast, move to a 12-month O2 Classic while those affiliate prices are still printed.
Stay on O2: Classic 80GB 12m — £10/mo →
Flexible alternative: iD 80GB rolling — £8/mo →
Live tracked alternatives (Nest + Awin 911601)
Lebara and SMARTY still appear as cash comparison brands on our SIM hub when retailer tiles are available, but Nest’s live Awin product feed today does not expose Lebara/SMARTY pclick rows. For conversion we only print retailer-verified Nest deep links below — O2 (3235), iD Mobile (6366), giffgaff (3599). That keeps every primary CTA tracked.
| Plan (Nest live 15 Sep 2026) | Term | £/mo | Data | Network angle | Tracked CTA |
|---|---|---|---|---|---|
| O2 Classic 50GB | 12 months | £8 | 50GB 5G | Stay on O2 | Get deal → |
| O2 Classic 80GB | 12 months | £10 | 80GB 5G | Stay on O2 | Get deal → |
| O2 Classic 120GB | 12 months | £12 | 120GB 5G | Stay on O2 | Get deal → |
| iD Mobile 50GB | 1 month rolling | £7 | 50GB 5G | Three mast · flexible | Get deal → |
| iD Mobile 80GB | 1 month rolling | £8 | 80GB 5G | Three mast · flexible | Get deal → |
| iD Mobile 20GB | 12 months | £7 | 20GB 5G | Cheaper lock if 20GB is enough | Get deal → |
| giffgaff 40GB | 18 months | £8 | 40GB 5G | EE consumer stack · community MVNO | Get deal → |
| giffgaff 25GB | 18 months | £10 | 25GB 5G | EE consumer stack | Get deal → |
| giffgaff Unlimited | 18 months | £14 (was £25) | Unlimited 5G | EE-stack · promo to 2 Oct 2026 23:59 | Get deal → |
| giffgaff Unlimited | 1 month rolling | £20 (was £35) | Unlimited 5G | Closest rolling substitute · promo to 2 Oct | Get deal → |
Want Lebara EU-roaming style or SMARTY’s non-legacy ladder as a cash cross-check? Open the live SIM only deals hub and filter by brand — then come back to a Nest-tracked Get deal button above when you are ready to click. We will not fake Awin pclicks for merchants missing from Nest.
Best SIM only deals UK September 2026 — how we rank after the O2 cull
September SIM guides on SwitchSquid still rank by 12-month cash where the retailer prints a lock, and by honest rolling cost where you refuse a lock. After the O2 30-day removal:
- Exact allowance + live checkout beats nostalgia for a dead O2 Classic rolling tile.
- O2 mast preference → live 12-month Classic rows above.
- Monthly exit preference → iD rolling 50GB/80GB tracked links.
- EE-stack preference → giffgaff goodybags / fixed terms above.
Deep-dives by allowance (internal): 10GB, 20GB, 30GB, 50GB, 60GB, 80GB, 100GB, 200GB, unlimited, no credit check, EU roaming.
giffgaff Unlimited as a rolling substitute (promo to 2 Oct 2026)
If you wanted O2’s dead 30-day ladder because you hate long locks and you burn through big data, Nest now shows a cleaner EE-stack answer than capped goodybags alone: giffgaff Unlimited.
- 18-month contract: £14/mo (was £25) — Nest product id 585419, Awin m=3599 deepLink below.
- Monthly rolling: £20/mo (was £35) — Nest product id 585420 (golden goodybag Unlimited / £20 top-up), closest tracked rolling unlimited substitute after O2 30-day dies.
Verified 15 September 2026 against help.giffgaff.com: activate / opt in by 11:59pm on 2 October 2026; discounted price then locks for the benefit period (18 months on contract, 12 months on rolling with auto-renew). After the promo window, list prices return toward £25 / £35. Existing members must opt in via the giffgaff app. Fair-usage / EU roaming caps still apply — read retailer terms.
Get giffgaff Unlimited 18m — £14/mo →
Get giffgaff Unlimited rolling — £20/mo →
O2 rolling monthly SIM alternatives — decision tree
Need the O2 network for coverage at home? Take a 12-month Classic while Nest still shows affiliate pricing — start with 50GB at £8 or 80GB at £10. Read the minimum term and any mid-contract price change clause on o2.co.uk before you pay.
Need to cancel month-to-month? iD’s rolling 50GB at £7 and 80GB at £8 are the clean Nest-tracked substitutes we can defend today. Check Three indoor signal with a coverage checker if you are leaving O2’s mast.
Happy on EE’s consumer radio? giffgaff remains a tracked Awin programme (3599) with goodybag-style plans — and right now Unlimited £14 (18m) / £20 rolling (promo to 2 Oct 2026 23:59) is the strongest Nest-tracked rolling substitute when O2 30-day dies and you do not want a 12-month O2 lock.
Still browsing 1-month filters? Use 1-month SIM only and compare 1-month — expect those grids to lean on MVNOs after 16 Sep, not O2 30-day Classic.
FAQ — O2 30 day SIM ending (AEO)
Is O2 ending 30-day SIMs?
Yes, for affiliate / SIMO 30-day propositions. O2 Mobiles (Awin merchant 3235) notified that 30-day SIMO tariffs are removed with effect from 16 September 2026 23:59. SwitchSquid soft-deleted Nest’s live O2 1-month SIM products the same day so we do not send traffic to dead offers.
What happens after 16 Sep?
New tracked clicks should go to live 12-month O2 SIMs or to non-O2 rolling SIMs (iD, giffgaff, and other hub brands). Old Classic 30-day ladder prices in third-party articles become historical. Your existing O2 contract continues under O2’s customer terms unless O2 tells you otherwise in-app or by email.
What are the best alternatives in the UK right now?
For O2 coverage: Nest-live Classic 12-month 50GB £8 / 80GB £10 / 120GB £12. For flexible monthly: iD 50GB £7 / 80GB £8. For EE-stack MVNO: giffgaff Unlimited £14 (18m) / £20 rolling (promo to 2 Oct 2026), plus goodybags such as 40GB £8 (18m). Cross-check Lebara/SMARTY cash on the SIM hub when you want those brand pages — primary Get deal buttons on this guide stay Nest-tracked.
Can I still buy an O2 rolling monthly SIM via SwitchSquid?
No — not as a live Nest product after the delist. Use 12-month O2 or switch brand. If a random blog still shows O2 30-day Classic tiles, treat it as stale.
Will 12-month O2 SIMs get more expensive when 30-day dies?
We cannot promise retailer pricing. We can only show current Nest deep links. If you want O2, buying a live 12-month Classic before the rolling catalogue disappears is the conservative move.
Does this affect phone contracts or only SIMs?
The Awin notice we actioned is about 30-day SIMO. Handset deals are a separate catalogue — see our iPhone / cheapest phone guides if you need a device.
Compare live O2 12-month 50GB — £8 →
Compare iD rolling 50GB — £7 →
Compare giffgaff 40GB — £8 →
How to switch before the deadline
- Decide mast: O2 vs Three (iD) vs EE-stack (giffgaff).
- Click a Get deal button above (Awin tracked, aff 911601).
- Request a PAC/STAC if you are keeping your number — guide: PAC code.
- Prefer eSIM? Read what is an eSIM and eSIM vs physical SIM.
- Re-check the O2 SIM hub after 16 Sep — it should emphasise 12-month O2, not dead 30-day Classic.
Why this matters for September SIM shoppers
Search demand around “O2 30 day SIM ending”, “O2 rolling monthly SIM alternatives”, and “best SIM only deals UK September” spikes when a big network culls a popular rolling ladder. The conversion mistake is sending that traffic to a soft hub page with no tracked checkout. This guide exists so every primary click is an Awin deep link Nest can attribute — while internal links keep you inside SwitchSquid’s September allowance guides and O2 / 1-month hubs for further research.
Editorial method (E-E-A-T)
We actioned the O2 Awin mid-3235 email in Nest admin on 15 September 2026: soft-deleted live O2 1-month / 30-day SIM products, left 12-month O2 SIMs online, then rebuilt this commercial guide with Nest deep links only for primary CTAs. Allowance guides linked above remain the place for September cash rankings; this page is the urgency / alternatives layer for the 16 Sep removal.
O2 Classic 120GB 12m — £12/mo →
iD 80GB rolling — £8/mo →
giffgaff 25GB — £10/mo →
giffgaff Unlimited rolling — £20/mo →
Affiliate disclosure: SwitchSquid may earn a commission via Awin (publisher 911601) when you buy through Get deal links. Prices and availability change — confirm on the retailer checkout. O2 30-day SIMO removal date per merchant programme email: 16 September 2026 23:59 UK.
