SMARTY SIM only deals

SMARTY SIM-only plans are built around flexibility, with a range of data allowances to suit different needs, from light users to those who want unlimited data.

Prices typically start from around £6 per month for lower-data plans, with higher allowances available at higher monthly costs. All plans include unlimited UK calls and texts as standard.

Our best SMARTY SIMs this week

Why choose a SMARTY SIM?

• Good coverage: Uses Three’s network, which covers around 99% of the UK population for 4G
• Flexible plans: All plans are 30-day rolling with no long-term commitment
• 5G included: Available at no extra cost on compatible devices and in supported areas
• No credit checks: Plans are paid upfront, so no credit check is usually required
• Data discount: Get money back for unused data on limited plans
• Group savings: Discounts available when you add multiple SIMs to one account
• Simple setup: No contracts, no handset bundles, just SIM-only plans

Is SMARTY a good network?

SMARTY is a good option if you’re looking for a low-cost, flexible SIM-only deal. Because it runs on Three’s network, it offers good coverage and competitive data performance in many areas.

Its main appeal is value and simplicity. While it doesn’t offer extras like entertainment perks or retail rewards, it focuses on keeping costs low and plans easy to manage.

Read our full Smarty network review here.

What to look for in a SMARTY SIM contract

When choosing a SMARTY SIM, the main things to consider are your data usage and monthly budget.

All plans include unlimited UK calls and texts, so the key difference between deals is how much data you need. If your usage varies, SMARTY’s rolling plans make it easy to switch each month.

Not sure Smarty is the right provider for you? Compare all SIM only deals here.

SMARTY’s best unlimited data SIMs

SMARTY offers an unlimited data plan on a 30-day rolling basis, making it a good option if you regularly stream, browse or use your phone as a hotspot.

All plans include unlimited UK calls and texts, with 5G available at no extra cost where coverage allows. While the plan is unlimited, it’s subject to fair use policies, particularly around non-personal use.

SMARTY’s best rolling contract SIMs (30-day / 1-month)

All SMARTY SIM-only deals are offered on 30-day rolling contracts, giving you full flexibility to change or cancel your plan each month.

Plans include unlimited UK calls and texts and a range of data allowances. SMARTY also offers a data discount on limited plans, where you get money back for unused data.

SMARTY’s best 12-month SIM deals

SMARTY doesn’t offer 12-month SIM-only contracts. Instead, it focuses entirely on flexible 30-day rolling plans.

This means you won’t get long-term contract discounts, but you do benefit from being able to switch or cancel your plan at any time.

SMARTY’s cheapest SIM-only deals

SMARTY’s cheapest SIM-only deals are suited to lighter users who mainly need calls, texts and a small amount of data.

Prices start from around £6 per month for lower-data plans. All plans include unlimited UK calls and texts, and you may receive a discount for unused data on capped plans.

Does SMARTY offer SIM plans for bad credit?

Yes. SMARTY plans don’t usually require a credit check because they are paid for upfront. This makes them a good option if you have a limited or poor credit history.

Understanding SMARTY contracts

SMARTY doesn’t offer long-term contracts. All plans run on a 30-day rolling basis, renewing each month unless you cancel.

This gives you the flexibility to switch plans or providers with minimal notice.

SMARTY SIMs with unlimited data

SMARTY offers an unlimited data plan alongside its capped data options. This can be a good choice if you regularly stream or use large amounts of data.

As with most networks, usage is subject to fair use policies, particularly for activities like tethering.

Can I use a SMARTY SIM in any phone?

Yes, as long as your phone is unlocked or compatible with Three’s network. Most modern phones in the UK are unlocked, but it’s worth checking with your provider if you’re unsure.

Should I get unlimited calls and texts?

All SMARTY SIM-only deals include unlimited UK calls and texts, so you don’t need to factor this into your decision.

Alternatives to SMARTY

If you’re comparing networks, alternatives like VOXI, giffgaff, iD Mobile and Lebara also offer low-cost SIM-only deals.

These providers compete on price and flexibility, though features such as perks or data rollover vary.

Can I use my SMARTY SIM abroad?

Yes, SMARTY allows you to use your UK allowance in the EU, subject to a fair usage policy. There is typically a data limit (often around 12GB), after which additional charges or add-ons may apply. Always check your destination and plan before travelling.

Can I get 5G enabled SMARTY SIMs?

Yes, all SMARTY SIMs are 5G-ready. You’ll need a 5G-compatible device and to be in an area with 5G coverage to access it.

Can I keep my mobile number if I switch to an SMARTY SIM-only deal?

Yes, you can keep your number by requesting a PAC (port authorisation code) from your current provider and giving it to SMARTY.

Do I need an unlocked phone to use an SMARTY SIM?

Yes, your phone needs to be unlocked to use a SMARTY SIM. Most phones sold in recent years are already unlocked.

Are SMARTY SIM-only deals cheaper than contracts?

SIM-only deals are often cheaper overall because you’re not paying for a handset. Buying a phone outright and pairing it with a SIM-only plan can work out more cost-effective in the long run.