SMARTY Mobile Review

Table of Contents Plans Value for money Extras and benefits Network Which network does Smarty use? Coverage Speeds Frequencies Customer Service Conclusion Alternatives

Plans

SMARTY has a range of plans for SIM Only and data only, more details of which can be seen in the table below. There is no contract or credit check to worry about.

Smarty Plans

				Mobile Phones				SIM Only				Data Only SIM
Plans Available				x				✔				✔
Max Data				x				Unlimited				Unlimited
Contract lengths				x				1 month				1 month

Value for money

SMARTY Mobile offers a range of competitively priced plans, topping out at unlimited data. But it also offers all sorts of other allowances, and its prices are lower than many rival networks.

SIM Only Deals

	45 GB data UNLIMITED mins UNLIMITED texts 1 Month Contract	£7.00 a month View Deal
	65 GB data UNLIMITED mins UNLIMITED texts 1 Month Contract	£8.00 a month View Deal
	100 GB data UNLIMITED mins UNLIMITED texts 1 Month Contract	£10.00 a month View Deal
	170 GB data UNLIMITED mins UNLIMITED texts 1 Month Contract	£12.00 a month View Deal
	5 GB data UNLIMITED mins UNLIMITED texts 1 Month Contract	£6.00 a month View Deal
View All Smarty Sim Only Deals

All plans are also just 1-month long, meaning you can change or cancel your plan almost whenever you want. The network notes that this means there essentially aren’t any annual price rises. That doesn’t mean prices will never go up, but it does mean that you’ll be free to cancel if you’re ever unhappy with price changes.

That makes it more flexible than some networks, though the fact that it just offers SIM Only plans makes it more limiting in some ways.

Extras and benefits

SMARTY has a number of extra benefits on its plans. Standouts include free roaming in the EU, no credit checks, and no annual price rises. More details of some of these features and others can be found below.

SMARTY perks and policies

	SIM Only
5G	✔
Free Roaming	✔ (EU only)
Tethering	✔
Wi-Fi Calling	✔
VoLTE	✔
Data Rollover	✖
Spending Caps	✖
Unlimited Data	✔
Family Plans	✔
Credit Check	✖

5G

SMARTY offers 5G at no extra cost on every single one of its plans, whether you’re a new or existing customer.

Roaming

SMARTY lets you roam at no extra cost across the EU. That means you can use unlimited minutes and texts and as much data as your plan generally offers, up to 12GB. You can also roam outside the EU but that will cost you extra and prices can be steep depending on your destination.

Tethering

SMARTY allows unrestricted tethering, which means you can share your mobile connection with other devices such as laptops and tablets. The only limit is your overall monthly data allowance, and as there's an unlimited data option this is potentially a great network for tethering.

Wi-Fi Calling

Wi-Fi Calling refers to making and receiving calls over Wi-Fi, while continuing to use your normal number (as opposed to a separate service such as WhatsApp). It’s a seamless way to keep communicating when there’s no mobile signal, and it’s offered by SMARTY.

VoLTE

VoLTE refers to calling and texting over 4G, rather than 2G or 3G. It means you can call in more places, as some places will only have a 4G signal, and it’s offered by SMARTY on a number of handsets.

Data rollover

SMARTY doesn’t offer data rollover, so you have to use all of your data each month or lose it.

Spending caps

SMARTY doesn’t offer spending caps, however most charges outside your plan are restricted unless you purchase an out of plan add-on, so you shouldn’t get hit with surprise bills.

Unlimited data

SMARTY offers plans with unlimited data, so you don’t need to worry about running out. There are no fair usage limits in the UK either, though abroad in the EU you’re limited to 12GB per month.

Family plans

SMARTY offers what it calls Group Plans, which allow you to add up to eight SIMs to your account, with a 10% discount on each of them. So it’s not a huge saving, but it’s still a nice way to keep costs down if you want multiple devices or people on your account.

And if everyone wants unlimited data then the discount rises to 25% for each additional plan – but only if every plan is an unlimited one.

Credit checks

There are no credit checks on any of SMARTY’s plans, making them ideal if you have a poor credit rating, as there’s no worry of not being accepted.

eSIMs

Smarty offers eSIMs with all of its plans, though at the time of writing you can’t request an eSIM at checkout. Rather, you have to sign up for a plan with a removable SIM card and then request a swap to an eSIM either when activating your SIM card or at any time via your online account.

Unique perks

The main unique perk on SMARTY is its ‘data discount’ plans, which refund you for any unused data at the end of the month. You get back the same amount of money as the data cost in the first place, so you’ll never pay for more than you use.

However, at the time of writing you can only get up to 3GB of data on these plans, so they’re only good for light users.

Network

Which network does SMARTY Mobile use?

SMARTY uses Three’s network – in fact, it’s run by Three, so it has coverage in all the same places, whether you’re connecting to 5G or 4G.

Coverage

Three’s coverage (and particularly its 5G coverage) is regularly improving, so SMARTY’s will improve with it. You can see an overview of how much coverage of each kind there is in the chart below.

Note that for 5G, we’ve used data from a 2025 Ofcom report, covering UK premises outdoors.

Smarty Coverage

Network Type	Coverage by population
5G	At least 71%
4G	99.8%
3G	Switched off
2G	N/A

Network Speeds

Opensignal January 2026 (speeds), and Speedtest 2H 2025 (latency)

Network	Download/upload speeds	Loaded latency (ms)
EE	53.2/10.4Mbps	583.53ms
Smarty (Three)	51.0/9.3Mbps	405.93ms
Vodafone	37.5/7.4Mbps	449.16ms
O2	32.8/6.4Mbps	1039.19ms

SMARTY’s use of Three’s infrastructure is mostly impressive when it comes to speeds, as in an Opensignal report from January 2026, Three was found to have an average download speed of 51.0Mbps, and an average upload speed of 9.3Mbps. You can see how that compares to other networks in the chart above. Those results factor in a combination of 5G and 4G.

When it comes to loaded latency (the amount of time it takes for the network to respond to a request when the connection is under heavy use), a 2025 Speedtest report found Three’s loaded latency came out at 405.93ms, which is the best on test.

For 5G, Three’s average download speed is 187Mbps according to the same 2026 Opensignal data. That’s higher than any other network achieved. Its median meanwhile was found to be 198.3Mbps in RootMetrics data from the second half of 2025, which sees it beat every network except EE.

That same report put Three’s 95th percentile 5G download speed (in other words what you can expect in the fastest 5% of instances) at 886.6Mbps, which is a higher speed than all rivals.

And a Speedtest report from 2025 put Three’s median 5G download speed at 214.02Mbps, rating it the UK's fastest 5G network. This same report also put Three’s median 5G upload speed at 13.08Mbps.

Traffic management

SMARTY’s traffic management policy is simpler than most, as it simply says that it doesn't enforce any data shaping or network throttling, which is to say that your speeds and bandwidth shouldn’t be intentionally slowed under any circumstances.

Frequencies

Network Frequencies

Frequency	Frequency Band	Network
700MHz	n29	5G
800MHz	Band 20	4G
1400MHz	Band 32	4G
1800MHz	Band 3	4G
2100MHz	Band 1	4G
3400MHz	n78	5G
3600-4000MHz	n77	5G
26,000MHz	n258	5G
40,000MHz	n259	5G

SMARTY uses Three’s spectrum, which means it has access to the 800MHz, 1400MHz, 1800MHz, and 2100MHz bands for 4G. The 800MHz band helps with indoor and rural coverage, while the 2100MHz band helps meet data demands in congested areas, and the 1400MHz and 1800MHz bands fill the middle ground.

For 5G, SMARTY presumably uses the 3.4GHz, 3.6-4GHz, 26,000MHz, and 40,000MHz bands, as Three has access to spectrum in those bands and it’s well-suited to 5G. Three also has 700MHz spectrum which could be used to bolster 5G, and might therefore also benefit SMARTY’s network. Though SMARTY hasn’t revealed which bands it uses for 5G at the time of writing.

Given that Three has now merged with Vodafone, SMARTY should increasingly have access to Vodafone’s spectrum too.

You can find in depth details of all these bands in our 4G and 5G frequencies guide.

Customer service

It’s difficult to get a measure of how good SMARTY’s customer service is, especially as it’s not been included in any major customer service surveys or reports.

However, given that the network positions itself as fair and honest it’s likely that it also puts a focus on delivering good customer service. That seems to be the case based on its 4.0/5 Trustpilot rating. That's from 47,786 reviews at the time of writing and is what Trustpilot calls a 'great' rating.

Stores

Smarty does not currently have any physical stores in the UK.

Conclusion

SMARTY is a good value network with high-speed data. Its other major strengths come from the low cost of its plans, its support for Wi-Fi Calling, and its 30-day plan durations.

This isn't a network for those who want to Pay As You Go or to get a phone on contract, but for everyone happy with SIM-only it's a simple, fair, and affordable option.

Alternatives

Since SMARTY uses Three’s coverage (and is owned by Three), Three itself is an obvious alternative. Three offers a wider range of plans, including smartphones on contract, but roaming comes at a premium.

iD Mobile is another option – this uses Three’s coverage too, and includes data rollover, which you don’t get on SMARTY. It’s typically good value as well.

Of course, if having the same coverage isn’t important to you then there are any number of alternatives, and you can find full reviews of most of them here.

VOXI is notable among those, because it’s a similar proposition in a lot of ways. It’s run by Vodafone and has the same coverage as that network, but is designed to be cheaper. Its plans also let you use select social media services and often also music and video streaming platforms without the data coming out of your allowance.