Monthy vs SMARTY
Monthy vs a SMARTY SIM
SMARTY is genuinely good and we're not going to pretend otherwise. £20 a month for unlimited data, one month at a time, cancel whenever. If your reset day is more than about a fortnight away, or you're thinking about switching networks anyway, go to SMARTY. Monthy only wins on the short gap — the four days before payday when you don't want a second monthly bill and you'll never think about us again afterwards.
Get me to reset dayWhat SMARTY actually sells
SMARTY sells rolling one-month plans on Three's network. Data Only: 100GB £17, Unlimited £20. With calls and texts: 5GB £6, 16GB £8, 40GB £10, 70GB £9, 100GB £12, 200GB £17, Unlimited £20. One-month terms, cancel anytime, no credit check. Promotional prices change often.
What a gap costs
Monthy prices come straight from our live price list. Theirs were read off their own site on 2 August 2026.
| Days to your reset day | Monthy | SMARTY |
|---|---|---|
| 1 day | £3.50 | £20 for the month (unlimited data-only) — you'd be buying 29 days you don't need |
| 3 days | £6.75 | £20 for the month |
| 5 days | £9.75 | £20 for the month |
| 7 days | £11.95 | £20 for the month |
Side by side
| Monthy | SMARTY | |
|---|---|---|
| What you're buying | A few days, priced to the day | A full month, priced monthly |
| Does it renew? | No — it can't, there's nothing to renew | Yes, monthly, until you cancel |
| Best for | A gap of 1–14 days | An ongoing need for more data |
| Cost over a year of monthly use | We'd be the wrong product | About £240 for unlimited |
| Setup | eSIM, live in a couple of minutes | eSIM or posted SIM |
| Keeps your number | Yes — data only, sits alongside your normal SIM | Yes — it's your existing line |
When SMARTY is the better buy
- Your reset day is more than two weeks away. We cap sales at 14 days precisely because SMARTY is better value past that point.
- You run out of data most months. That's not a gap, that's a plan that's too small — a £20 SMARTY SIM fixes it properly.
- You want calls and texts too. Monthy is data only, always.
Get me to reset day
30 secondsWhen does your normal data reset?
Or just tell us how long
Pick your reset day and we'll work out the rest — you'll see the exact price before you pay anything.
Nothing arrives in the post. Monthy is a second data connection your phone downloads itself — it takes about a minute, and your normal SIM stays exactly where it is.
Common questions
- Is SMARTY cheaper than Monthy?
- Per gigabyte, yes, comfortably. Per gap, no — a rolling month costs you a month whether you needed four days of it or not.
- Why do you cap Monthy at 14 days?
- Because beyond a fortnight the maths stops favouring us. A £20 rolling SIM is better value, so we stop selling and say so rather than take the money.
- Can I use both?
- People do. A SMARTY SIM as your main line and a Monthy on the odd month a trip or a hotspot session blows through the allowance.
- Does SMARTY use the same network as Monthy?
- SMARTY runs on Three. Monthy's data runs on UK networks through our wholesale supply — you don't switch anything or move your number either way.
Where these numbers came from
Prices checked 2 August 2026. Other networks change their prices without telling us — always check theirs before you buy.