on ThreeSMARTYvson ThreeiD Mobile
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We compared every SMARTY and iD Mobile plan by what it costs per month across the whole contract, not the price in the advert.
Both run on Three's network, so coverage and signal should be the same wherever you are.
The verdictWhich is cheaper?
Light use (5GB+)
Near enough a tie
SMARTY: 5GB · rolling monthly
iD Mobile: 1m 6GB
Everyday (30GB+)
iD Mobile
SMARTY: 40GB · rolling monthly
iD Mobile: 24m 30GB
£36.00 a year less with iD Mobile
Heavy use (100GB+)
iD Mobile
SMARTY: 100GB · rolling monthly
iD Mobile: 24m 100GB
£39.00 a year less with iD Mobile
iD Mobile advertises £5.00: an intro price for 6 months.
Unlimited data
iD Mobile
SMARTY: Unlimited · rolling monthly
iD Mobile: 24m Unlimited
£48.00 a year less with iD Mobile
iD Mobile is cheaper for 3 of 4 uses at the price everyone pays.
Side by sideAt a glance
| SMARTY | iD Mobile | |
|---|---|---|
| Network it runs on | Three | Three |
| Contracts | rolling | rolling, 12 months, 24 months |
| Price rises | Not stated on the plan pages | Price locked: no annual rises |
| EU roaming | Included, 12GB | Included, 30GB |
| Cheapest plan | £6.00/mo · 5GB | £6.00/mo · 6GB |
| Cheapest unlimited | £20.00/mo · rolling monthly | £16.00/mo · 24 months |
| 5G | Included | Included |
Monthly vs contractThe cost of not being tied in
- SMARTY: 30GB+ only comes on rolling monthly plans (from £10.00/month).
- iD Mobile: rolling from £8.00/month vs £7.00 on a 24-month contract. Not being tied in costs about £12.00 a year.
Read before you switchCatches worth knowing
- The advert is the intro price. iD Mobile's 24m 250GB is advertised at £7.00, but costs £12.25 a month across the contract: 75% more.
- Better plan, same network. 1 of these 36 plans are beaten by another plan from the same network: more data for the same or less money. They carry a green tag below.
8 plansEvery SMARTY plan, by real monthly cost
What the columns mean
- Plan
- The network's own name for the plan. The coloured tags under it are the catches: intro prices, bonus data that ends, Clubcard-only prices, price rises and roaming limits.
- Data
- Your monthly UK data once any bonus data has ended. "Unlimited" is subject to the network's fair-use policy.
- Contract
- Rolling: a monthly plan you can leave any month. Its price is not fixed unless the network says so. 12m / 18m / 24m: a fixed-term contract for that many months, usually cheaper per month but you are tied in, and leaving early normally costs a fee. We have not collected exit fees, so check the network's terms.
- Real cost / month
- The average of every monthly payment across the whole contract (24 months for rolling plans), including intro prices ending and stated price rises. This is the number plans are ranked by, not the advertised price.
- Price over time
- Each block is a run of months at one price. Green is an intro price, grey the normal price, red the price after a stated rise. Taller means dearer.
- Total
- Everything you would pay across the contract (24 months for rolling plans).
- £/GB
- Real cost per month divided by the monthly data. Lower is better value. Not shown for unlimited plans.
- EU roaming
- Whether you can use your allowance in the EU at no extra cost, and any data cap while you are there.
| PlanThe network's own name for the plan. The coloured tags under it are the catches: intro prices, bonus data that ends, Clubcard-only prices, price rises and roaming limits. | DataYour monthly UK data once any bonus data has ended. "Unlimited" is subject to the network's fair-use policy. | ContractRolling: a monthly plan you can leave any month. Its price is not fixed unless the network says so. 12m / 18m / 24m: a fixed-term contract for that many months, usually cheaper per month but you are tied in, and leaving early normally costs a fee. We have not collected exit fees, so check the network's terms. | Real cost / monthThe average of every monthly payment across the whole contract (24 months for rolling plans), including intro prices ending and stated price rises. This is the number plans are ranked by, not the advertised price. | Price over timeEach block is a run of months at one price. Green is an intro price, grey the normal price, red the price after a stated rise. Taller means dearer. | TotalEverything you would pay across the contract (24 months for rolling plans). | £/GBReal cost per month divided by the monthly data. Lower is better value. Not shown for unlimited plans. | EU roamingWhether you can use your allowance in the EU at no extra cost, and any data cap while you are there. | |
|---|---|---|---|---|---|---|---|---|
| 5GB5GB · Rolling monthly | 5GB | Rolling | £6.00 | £144.00 24 months | £1.20 | included (12GB fair use) | SMARTY | |
16GB16GB · Rolling monthly
| 16GB | Rolling | £8.00 | £192.00 24 months | £0.50 | included (12GB fair use) | SMARTY | |
| 20GB20GB · Rolling monthly | 20GB | Rolling | £9.00 | £216.00 24 months | £0.45 | included (12GB fair use) | SMARTY | |
| 40GB40GB · Rolling monthly | 40GB | Rolling | £10.00 | £240.00 24 months | £0.25 | included (12GB fair use) | SMARTY | |
100GB100GB · Rolling monthly
| 100GB | Rolling | £12.00 | £288.00 24 months | £0.12 | included (12GB fair use) | SMARTY | |
| 150GB150GB · Rolling monthly | 150GB | Rolling | £15.00 | £360.00 24 months | £0.10 | included (12GB fair use) | SMARTY | |
| 200GB200GB · Rolling monthly | 200GB | Rolling | £17.00 | £408.00 24 months | £0.09 | included (12GB fair use) | SMARTY | |
UnlimitedUnlimited · Rolling monthly
| Unlimited | Rolling | £20.00 | £480.00 24 months | — | included (12GB fair use) | SMARTY |
23 plansEvery iD Mobile plan, by real monthly cost
| PlanThe network's own name for the plan. The coloured tags under it are the catches: intro prices, bonus data that ends, Clubcard-only prices, price rises and roaming limits. | DataYour monthly UK data once any bonus data has ended. "Unlimited" is subject to the network's fair-use policy. | ContractRolling: a monthly plan you can leave any month. Its price is not fixed unless the network says so. 12m / 18m / 24m: a fixed-term contract for that many months, usually cheaper per month but you are tied in, and leaving early normally costs a fee. We have not collected exit fees, so check the network's terms. | Real cost / monthThe average of every monthly payment across the whole contract (24 months for rolling plans), including intro prices ending and stated price rises. This is the number plans are ranked by, not the advertised price. | Price over timeEach block is a run of months at one price. Green is an intro price, grey the normal price, red the price after a stated rise. Taller means dearer. | TotalEverything you would pay across the contract (24 months for rolling plans). | £/GBReal cost per month divided by the monthly data. Lower is better value. Not shown for unlimited plans. | EU roamingWhether you can use your allowance in the EU at no extra cost, and any data cap while you are there. | |
|---|---|---|---|---|---|---|---|---|
| 24m 10GB10GB · 24 months | 10GB | 24m | £6.00 | £144.00 24 months | £0.60 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 12m 8GB8GB · 12 months | 8GB | 12m | £6.00 | £72.00 12 months | £0.75 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 6GB6GB · Rolling monthly | 6GB | Rolling | £6.00 | £144.00 24 months | £1.00 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 24m 30GB30GB · 24 months | 30GB | 24m | £7.00 | £168.00 24 months | £0.23 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 12m 20GB20GB · 12 months | 20GB | 12m | £7.00 | £84.00 12 months | £0.35 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 10GB10GB · Rolling monthly | 10GB | Rolling | £7.00 | £168.00 24 months | £0.70 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 24m 60GB60GB · 24 months | 60GB | 24m | £8.00 | £192.00 24 months | £0.13 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 12m 50GB50GB · 12 months | 50GB | 12m | £8.00 | £96.00 12 months | £0.16 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 40GB40GB · Rolling monthly | 40GB | Rolling | £8.00 | £192.00 24 months | £0.20 | included (50 destinations, 30GB fair use) | iD Mobile | |
24m 100GB100GB · 24 months
| 100GB | 24m | £8.75advert £5.00+75% vs advert | £210.00 24 months | £0.09 | included (50 destinations, 30GB fair use) | iD Mobile | |
12m 90GB90GB · 12 months
| 90GB | 12m | £8.75advert £5.00+75% vs advert | £105.00 12 months | £0.10 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 80GB80GB · Rolling monthly | 80GB | Rolling | £10.00 | £240.00 24 months | £0.12 | included (50 destinations, 30GB fair use) | iD Mobile | |
12m 150GB150GB · 12 months
| 150GB | 12m | £10.50advert £6.00+75% vs advert | £126.00 12 months | £0.07 | included (50 destinations, 30GB fair use) | iD Mobile | |
24m 150GB150GB · 24 months
| 150GB | 24m | £10.50advert £6.00+75% vs advert | £252.00 24 months | £0.07 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 120GB120GB · Rolling monthly | 120GB | Rolling | £12.00 | £288.00 24 months | £0.10 | included (50 destinations, 30GB fair use) | iD Mobile | |
24m 250GB250GB · 24 months
| 250GB | 24m | £12.25advert £7.00+75% vs advert | £294.00 24 months | £0.05 | included (50 destinations, 30GB fair use) | iD Mobile | |
12m 200GB200GB · 12 months
| 200GB | 12m | £12.25advert £7.00+75% vs advert | £147.00 12 months | £0.06 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 200GB200GB · Rolling monthly | 200GB | Rolling | £14.00 | £336.00 24 months | £0.07 | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 250GB250GB · Rolling monthly | 250GB | Rolling | £15.00 | £360.00 24 months | £0.06 | included (50 destinations, 30GB fair use) | iD Mobile | |
24m UnlimitedUnlimited · 24 months
| Unlimited | 24m | £16.00 | £384.00 24 months | — | included (50 destinations, 30GB fair use) | iD Mobile | |
| 1m 300GB300GB · Rolling monthly | 300GB | Rolling | £16.00 | £384.00 24 months | £0.05 | included (50 destinations, 30GB fair use) | iD Mobile | |
12m UnlimitedUnlimited · 12 months
| Unlimited | 12m | £17.00 | £204.00 12 months | — | included (50 destinations, 30GB fair use) | iD Mobile | |
1m UnlimitedUnlimited · Rolling monthly
| Unlimited | Rolling | £18.00 | £432.00 24 months | — | included (50 destinations, 30GB fair use) | iD Mobile |
The small print, in large printWhat these numbers don't tell you
- Real cost / month assumes you join on 2 October 2026 and stay for the whole contract. Rolling plans are costed over 24 months at today's price; a rolling plan's price is not fixed unless the network says so, but you can leave any month.
- Stated price rises are included where the network publishes them in pounds and pence. Where a network says nothing about rises, we assume none, which may flatter it.
- Not included yet: early exit fees on contracts, speed caps, fair-use limits on "unlimited" data, tethering limits and charges for going over your allowance. We have not collected these, so we make no claims about them.
- £/GB uses the ongoing allowance, not temporary bonus data.
- Price over time bars: green months are an intro price, grey the normal price, red months after a stated rise. Bar height is that month's price.
- Coverage depends on where you live. Check your postcode on Ofcom's coverage checker.