Independence note: askotto is an independent consumer-information and consultancy publisher. We are not a mobile network, and we are not owned by, partnered with, or endorsed by Three, O2, Sky Mobile, EE, Vodafone or any provider named in these reports. Everything here is general guidance, marked and written by our own reviewers; confirm current details with the network before acting. Our phone and WhatsApp lines reach askotto consultants only — never a network's own customer service.
| Criterion | Mark | Examiner's note |
|---|---|---|
| Coverage & signal | B | Solid national reach; documented evening slowdowns in busy city centres. |
| Value for money | B | Mid-table pricing, lifted by perks and split contracts. |
| Data rules | B | Fair at home; tethering clauses on some tiers. |
| Roaming | A | The last big-four network with inclusive EU roaming on standard plans. |
| App & support | B+ | MyO2 for admin, Priority for perks — one login guards both. |
| Flexibility & exit | A- | Split contracts mean device payments genuinely stop. |
Criterion 01
B+Identity, ownership & history
O2 began life as BT's Cellnet and re-emerged under the bubbles in 2002. Since 2021 it has been half of Virgin Media O2 — and it plays landlord to more of the market than any rival: Tesco Mobile, giffgaff and Sky Mobile all transmit on O2 masts.
Corporate familyVirgin Media O2 (since 2021).
Tenant brandsTesco Mobile, giffgaff, Sky Mobile — identical signal, different shopfronts.
The stanceKept inclusive EU roaming on standard plans when every big rival retreated to daily fees.
3G statusRetired during 2025 — the last big switch-off. 4G Calling on; elderly handsets out.
Satellite trials2025–26 Starlink-partnered satellite messaging pilots aimed at rural not-spots — run by the network, free of charge.
Red-pen note: A 'satellite activation fee' does not exist. Anyone charging one is running a scam on the back of a real trial.
Criterion 02
BSIM plans & the Priority perk machine
One-month rollingThe commitment-free audition tier.
12–24 month fixedCheaper for the promise; exit figures disclosed in the PAC reply.
Pay as you goCheckless and light — spares, kids, trials.
UnlimitedAvailable across tiers; the usual bends (tethering, congestion, foreign ceilings) marked in Criterion 6.
Extra household SIMsMulti-line discounts under a single account.
PriorityA separate perks app: presales, freebies, weekly offers. Enjoyable — but never a reason to accept one bar in your kitchen.
Marking scheme
- Spend cap on at activation — free, instant, in MyO2.
- Size data from three measured months, not instinct.
- Score the plan on signal and total cost first; count perks only as a tiebreak.
Criterion 03
A-Phone contracts — the split that earns marks
O2's signature construction is the split contract, and it is genuinely consumer-friendly:
Device planThe handset on its own credit agreement — payments stop the moment it is repaid. No paying forever for a finished phone.
Airtime planMinutes, texts and data billed separately — downgradeable once the device clears.
Early settlementClear the device balance whenever you like and keep only the airtime.
Credit checksAttach to the device agreement; airtime-only stays light.
Trade-in & upgradesSame law as everywhere — second quote on the trade-in, and total any upgrade against outright-plus-SIM before nodding.
Red-pen note: Because the two halves are visible, O2's arithmetic is unusually easy to audit. Use that: the transparency is only worth marks if you actually read both lines.
Criterion 04
B+eSIM & device features
IssueMyO2, the website or shops; broad recent-flagship support; live in minutes.
Number movesFree PAC text to 65075 — plastic and digital alike.
Travel pairingBeyond Europe, an O2 line plus a local data eSIM frequently beats daily passes even with the EU perk.
ReissuesOfficial channels only; paid 'transfer help' is fraud.
Wi-Fi & 4G CallingMature support on mainstream handsets — both on, given the 3G retirement.
The loginMyO2 guards the number your bank texts. Strongest password you own; codes read to no caller, ever.
Criterion 05
BBroadband & the Virgin bundle
In this family, home broadband means Virgin Media — cable and expanding full fibre. Wires, not masts: whether your street is cabled and whether your bedroom has O2 bars are two unrelated questions.
- The bundle lever: homes pairing Virgin broadband with O2 mobile keep being offered bonus data or discounts — price the pair, not the parts.
- Volt-style mechanics have historically doubled mobile data or boosted broadband speed; the current shape lives on official pages.
- No cable on your street? O2 mobile works regardless — the broadband arm is simply not in play.
Criterion 06
AData, unlimited & roaming — the EU holdout
The roaming stance that sets O2 apart
- Standard O2 plans include EU roaming — alone among the big four — under a fair-use ceiling (historically around the 25GB mark; O2's pages carry today's exact figure), with per-GB rates beyond it.
- Outside Europe, daily travel passes by destination are switched on in MyO2.
- Unlimited plays fair on the handset at home; hotspot-heavy tiers carry tethering clauses worth reading; nothing stays unlimited abroad.
Pre-flight, five minutes
- Spend cap confirmed on.
- Fair-use ceiling for your destination noted.
- Longer trip? Price a local data eSIM against the passes.
- Data off at sea — maritime rates answer to no cap.
Criterion 07
B+Fees, two apps & getting help
Airtime monthlyJudge post-discount, as everywhere.
Device monthlyIts own agreement — ends at repayment, settleable early. The tidy half of the split.
Mid-contract risesPounds-and-pence disclosure before signature, mandatory since January 2025.
Leaving earlyAirtime term charge plus any device balance — both itemised in the PAC reply.
Out-of-contract driftThe airtime keeps billing until told otherwise; diarise the device end date.
Two apps, one precious login
MyO2 is the office — allowances, bills, caps, roaming, eSIM, device balance. Priority is the party — offers and presales. The shared login is exactly what "free Priority reward" phishing hunts. The five-second defence: genuine offers appear inside the account; anything a caller describes that the app cannot see is already exposed. Complaints ride the standard ladder — written complaint, eight weeks or deadlock, then the free binding ombudsman.
Criterion 08
B-Why the signal glitches — fault diagnosis
Evenings crawl in the cityThe documented one: full bars, treacle data, roughly 5–7pm in congested centres. Trial your own evenings before signing.
Sudden local outageMast maintenance — status page plus postcode before any settings safari.
Elderly handset, failed callsThe 2025 3G retirement — 4G Calling on.
The cursed roomWalls beat radio; Wi-Fi Calling is the cure.
Tenant confusionTesco, giffgaff and Sky customers ring their own brand, never O2 — the masts are shared, the accounts are not.
Criterion 09
BFinal verdict, joining & leaving
Credit awarded
- Inclusive EU roaming on standard plans — unique among the four
- Split contracts: device payments that truly stop
- Priority perks and venue presales
- Pennies-cheap auditions via giffgaff and Tesco on identical masts
- Satellite trials hunting the last dead zones
Marks lost
- Average speeds often trail the fastest rivals
- The evening city slowdown is measured, not rumoured
- Perks tempt people past bad postcodes
- Satellite is a pilot, not a promise
Joining & leaving — the safe order of operations
- Postcode check on O2's checker and Ofcom's, weighting indoor readings.
- Audition with a short giffgaff or Tesco Mobile plan — O2's exact masts for less.
- Exit anytime with the free PAC text to 65075; the reply itemises any airtime charge and device balance.
- Stuck complaint? Eight weeks or a deadlock letter opens the free, binding ombudsman.
Independence note: askotto is an independent consumer-information and consultancy publisher. We are not a mobile network, and we are not owned by, partnered with, or endorsed by Three, O2, Sky Mobile, EE, Vodafone or any provider named in these reports. Everything here is general guidance, marked and written by our own reviewers; confirm current details with the network before acting. Our phone and WhatsApp lines reach askotto consultants only — never a network's own customer service.