What network does SMARTY use?
SMARTY is Three's own MVNO sub-brand, running on Three's network infrastructure. SMARTY customers get the same 4G and 5G signal as Three customers — and SMARTY explicitly includes access to Three's 5G at no extra cost. Unused data is refunded at the end of each month. Enter your postcode above to see SMARTY's (Three's) signal scores for your area.
Is SMARTY coverage the same as Three?
Yes. SMARTY is owned and operated by Three and uses Three's own masts. Coverage is identical to Three at every UK location. Because SMARTY is Three's own brand rather than an independent MVNO, customers are not deprioritised behind direct Three customers during peak periods — they are on the same tier.
SMARTY's value: Three network, get refunded for unused data
How good is SMARTY coverage in the UK?
SMARTY signal matches Three's national profile: strong in cities and urban centres, with the UK's best 5G spectrum depth and signal scores in many urban areas. Three's outdoor 4G covers more than 99% of the UK population. Three's 5G uses a contiguous 100 MHz block of mid-band spectrum — more than any other UK network — giving it a speed and density advantage in city centres.
Where is SMARTY coverage best?
SMARTY coverage follows Three's footprint. Three is the best network in 12 of 100 UK postcode districts measured here. Three's strongest region is London with 6 districts. Three's top district is Bromley (BR1) at 83/100.
Which other networks use Three?
SMARTY, iD Mobile all run on Three's network. All 2 get the same Three outdoor 4G signal and the same indoor and 5G coverage. The difference between them is pricing, contract terms and added features — not signal.
SMARTY coverage compared with EE, O2, Vodafone
Since SMARTY runs on Three, its coverage follows Three's position in the comparison. Three scores 78/100 for outdoor 4G and 64/100 for indoor signal.
| Metric | EE | O2 | Vodafone | SMARTY / Three |
|---|---|---|---|---|
| Outdoor 4G | 88↑ | 85 | 83 | 78 |
| Indoor 4G | 74↑ | 71 | 69 | 64 |
| Outdoor 5G | 68 | 60 | 65 | 72↑ |
| Video Calls | 86↑ | 82 | 80 | 75 |
| Streaming | 85↑ | 81 | 79 | 77 |
Scores out of 100. ↑ marks the leader on each metric. SMARTY (as Three) is highlighted.
Is SMARTY worth it?
SMARTY is one of the best-value ways to get Three-class 5G coverage. Plans are SIM-only with no contract, and unused data is automatically refunded monthly. It suits data-conscious users who want 5G without a long commitment. The trade-off versus a direct Three contract is fewer plan options and less corporate customer service infrastructure.
Frequently asked questions
What network does SMARTY use?
SMARTY uses the Three network. It is Three's own MVNO brand and shares Three's infrastructure.
Does SMARTY have 5G?
Yes. SMARTY includes 5G at no extra cost on all plans. It uses Three's 5G network, which has the largest spectrum allocation of any UK operator.
Is SMARTY coverage as good as Three?
Yes — SMARTY is owned by Three and uses Three's own masts. Coverage is identical and there is no deprioritisation compared with direct Three customers.
What other networks use Three?
iD Mobile also runs on Three's network. Both get the same coverage and 5G access as Three customers.
Check SMARTY coverage at your postcode
SMARTY uses Three's signal — enter your postcode to see exactly what you'd get.
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