Three's home broadband delivers an internet connection over its mobile 5G network rather than a fixed telephone line, which means no landline, no engineer installation and setup as simple as plugging in a router. It fits properties with strong 5G signal well, particularly flats and homes where fixed-line installation is inconvenient, but performance depends entirely on local 5G coverage rather than a guaranteed fibre connection, which is the key trade-off against traditional fixed-line broadband. |
Kael Tripton · UK Telecoms Desk · Primary sources only |
TL;DR
Last reviewed: July 2026 |
KEY FACTS
|
| Delivery method | Three's 5G mobile network |
| Landline needed | No |
| Installation | Self-install, plug-and-play router |
| Speed dependency | Local 5G signal strength, not a fixed cable guarantee |
| Best fit | Flats, new builds, or fast-turnaround house moves |
How 5G home broadband actually works
Three's home broadband product uses the same mobile network that powers Three's phone SIMs, but delivers it through a dedicated router designed to sit in a fixed location at home rather than travel in a pocket. There is no telephone line, no Openreach engineer visit, and no waiting weeks for installation: the router arrives, gets plugged in, and connects to Three's 5G signal directly.
This is fundamentally different from fixed-line fibre or full-fibre broadband, which relies on a physical cable running to the property. 5G home broadband instead depends entirely on the strength and capacity of the mobile signal reaching that address, the same variable that determines phone signal quality.
Where this fits well, and where it doesn't
The clearest use case is speed of setup: someone moving into a new flat who needs internet immediately, without waiting for a fixed-line installation slot, benefits enormously from a plug-and-play 5G router. It also suits renters who may move again within a year or two and don't want to be tied to fixed-line contract terms tied to a specific address.
The clearest limitation is coverage dependency: an address with weak or congested 5G signal will get correspondingly poor broadband performance, regardless of what a fixed-line fibre connection at the same address might achieve. Properties in areas with strong 4G/5G coverage but no full-fibre rollout can actually come out ahead with 5G home broadband; properties with excellent fibre availability but patchy mobile signal will generally do better with a fixed-line alternative.
Checking suitability before signing up
Because performance is signal-dependent rather than a fixed guarantee, checking Three's own coverage checker for the specific address, and ideally testing an existing Three SIM's data speed at that address, gives a realistic sense of what the home broadband product will deliver before committing. Some providers, including Three, offer a trial period specifically because 5G home broadband suitability varies so much by address.
Contract terms and switching
Three's home broadband plans have typically been offered on rolling or shorter commitment terms compared with the 18-24 month contracts common for fixed-line fibre, reflecting the lower installation cost and effort involved. Leaving is correspondingly simple: there is no landline number to port and generally no lengthy exit process, since the product is essentially a mobile data plan attached to a fixed router.
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Frequently asked questions
Do I need a landline for Three home broadband?
No: Three's home broadband delivers internet over the 5G mobile network, with no telephone line or fixed cable required at all.
How do I know if 5G home broadband will work well at my address?
Checking Three's coverage checker for the specific postcode, and ideally testing an existing mobile data speed at that address, gives the most realistic picture, since performance depends entirely on local 5G signal strength rather than a fixed guarantee.
Is 5G home broadband cheaper than fibre?
Pricing is often competitive with entry-level fixed-line packages, but the more relevant comparison for most households is suitability rather than price alone: an address with weak 5G signal will underperform regardless of the price, and an address with excellent full-fibre availability may get a faster, more consistent connection from a fixed-line provider instead.
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