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SMARTY Coverage Checker

Check official SMARTY signal strength. Enter your postcode to see combined 4G and 5G coverage, indoors and outdoors.

Virtual Network (MVNO) Uses Three Network
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Data provided by Ofcom • Updated regularly

SMARTY is Three's own sub-brand offering SIM-only plans on 1-month rolling contracts with no credit checks. Running on Three's full network, SMARTY is known for its unique cashback feature that refunds you for any data you don't use each month.

About SMARTY Coverage

SMARTY was launched by Three in 2017 as a digital-first, no-nonsense mobile provider aimed at customers who want flexibility and transparency. As a direct subsidiary of Three, SMARTY uses Three's complete network infrastructure, meaning coverage is identical to what Three customers experience. This includes access to Three's 4G network covering around 99% of the UK population and its growing 5G network in major urban centres.

The standout feature of SMARTY is its approach to unused data. Unlike most providers, SMARTY calculates how much data you haven't used at the end of each month and credits the equivalent value back to your next bill. This makes it an excellent choice for people whose data usage varies month to month. Combined with 1-month rolling contracts that you can cancel anytime, SMARTY offers a level of flexibility that's hard to match.

Coverage on SMARTY is determined entirely by Three's network. In urban and suburban areas, you can expect solid 4G coverage and access to 5G where Three has rolled it out. Three's network has traditionally been slightly less extensive in deep rural areas compared to EE, but the Shared Rural Network initiative is closing that gap. Three's 5G rollout is also progressing well, with coverage expanding across dozens of cities.

Before signing up, check your postcode using our coverage tool above to see exactly what Three's network delivers at your location. Since SMARTY plans are month-to-month with no commitment, you can always try the service and switch if coverage doesn't meet your needs, making it a low-risk option to test.

SMARTY Coverage FAQ

SMARTY runs on Three's network. As Three's own sub-brand, SMARTY customers get full access to Three's 4G and 5G infrastructure, providing the same coverage as a Three direct plan.
Yes, SMARTY offers 5G access through Three's network at no extra cost. 5G is available in a growing number of UK cities and towns. Use our coverage checker to see if 5G is available at your postcode.
Yes, SMARTY coverage is identical to Three's coverage. Both services use exactly the same masts and network infrastructure. Wherever Three has signal, SMARTY will have the same signal.
Since SMARTY operates on 1-month rolling contracts with no commitment, you can cancel at any time if coverage doesn't meet your expectations. Check your postcode with our coverage tool before signing up to get an accurate picture of signal strength.