Yes if your dropped calls spread across more than two rooms or two floors. The G250 lifts coverage to 250 m² versus 150 m², upgrades the outdoor antenna to 7 dBi (from 5 dBi), pushes maximum gain to 65 dB (from 60 dB), improves the noise figure to ≤5 dB (from ≤5.5 dB) and extends the coax to 10 m (from 5 m). If you live in a two-bed flat, the G150 at £85 is enough. If your home has three or four bedrooms, a home office or a basement room that keeps dropping calls, the £110 G250 is the right size.

In most UK three-bed semis (around 90–120 m² built footprint, two floors) the answer is yes, especially if the indoor unit sits on the upstairs landing and the outdoor antenna points at the nearest O2 / Vodafone mast. 250 m² / 2,691 ft² is the rated maximum, so expect strong bars on the landing floor and decent bars one wall away. In weak rural fringe-signal areas coverage can drop to 150–200 m², in which case we recommend the optional 15 m / 20 m coax or a higher-gain antenna upgrade. It will not cover a five-bed detached house, a converted barn or a three-storey townhouse — for that you need the C-series.

In England and Wales a single domestic outdoor antenna under certain size limits usually falls under permitted development, so you do not need full planning consent for a small wall or chimney mount. However, if you lease your home, live on an estate with restrictive covenants, or are a renter, you should check your tenancy agreement or ask the freeholder before drilling. Renters can use a temporary window clamp or fascia bracket instead of a drilled wall fix, and the 365-day return lets you trial it in situ. Listed buildings and conservation areas have extra rules — check with your local planning office.

The G250 is voice-and-SMS-only on Band 8 (900 MHz) at £110.00, while the C100 is a separate multi-band 4G LTE data booster priced a touch lower. If your only pain is missed calls and failing texts on O2 / Vodafone / giffgaff / Sky Mobile, the G250 gives you more voice coverage (250 m²) for the same money. If you also need to stream, video-call over mobile data or run a home office on 4G, the C100 or a higher C-series unit is the better choice. The G250 will not speed up your mobile internet.

About 2 dB of extra antenna gain, which nearly doubles the effective signal pulled from the donor point. In practice that means a house that sat on the edge of usable G150 coverage — weak bars in the back bedroom, cut-outs on client calls — will hold a solid call once the 7 dBi antenna is aimed at the mast. It is the reason the G250 is recommended for three-four-bed homes and fringe rural signal rather than two-bed flats. If your outdoor signal is already strong, the jump is less dramatic; if it is marginal, the 7 dBi antenna is the part that makes the 65 dB gain usable across 250 m².

The G250 is tuned for exactly this marginal-but-present donor level: 65 dB gain plus the 7 dBi antenna take a weak 1 bar and re-broadcast it as a strong indoor signal. In practice, expect the rooms nearest the indoor unit to hold four bars, and the furthest bedroom or basement to hold two to three bars. If you stand outside your front door and your phone shows zero bars and runs emergency-only, no Ofcom-legal booster at this price can manufacture signal from nothing. Check Band 8 field mode on your phone before ordering, and consider the 15 m coax or higher-gain antenna upgrade if you are deep rural.

Yes — 250 m² is deliberately rated for small commercial footprints: a three-room high street office, a home office plus a workshop, a small studio, a two-chair clinic or a corner shop with back office. Unlimited simultaneous users means staff and customers on O2 / Vodafone / giffgaff / Sky Mobile all benefit at once, and card-terminal SMS goes through. If your premises are open-plan under 250 m², the G250 is the right size; if you need whole-building 4G data as well, look at the C200 / C250 range instead.

In a three-four-bed house the donor antenna usually sits on the roof ridge, chimney or gable end, while the indoor unit lives on an upstairs landing or in a central hallway — that routing easily needs 8–12 m. The 10 m standard length is what makes the 250 m² two-floor rating realistic. If your donor point is further away — for example a mast-side pole in the garden or a chimney on a detached house — the G250 supports an optional upgrade to 15 m or 20 m low-loss coax. Longer cable loses a little signal, so pair a 15 m / 20 m run with the higher-gain antenna upgrade to keep the 65 dB effective gain.

Budget 30–45 minutes for a competent DIYer. You will need a cordless drill for the wall bracket, a screwdriver and a spanner for the coax connectors. The G250 is designed for self-install: mount the outdoor antenna, run the 10 m coax through a drilled wall or slightly opened window, sit the indoor unit centrally, and plug in the 240V mains adapter. AGC locks on within about 60 seconds and you make a test call from each room. No engineer visit, no call-out fee, no Ofcom licence — but if you are not comfortable on a ladder or drilling an exterior wall, ask a local handyman for an hour of their time.

Very little. The G250 draws under 10 W from the 240V UK mains adapter — about the same as a single LED downlight left on 24/7. At typical UK domestic electricity rates that works out at roughly £12 per year of continuous running, under £1 a month. There is no subscription, no SIM contract, no monthly fee — once bought, the unit just sits on the wall and amplifies the O2 / Vodafone Band 8 signal you already pay for through your existing phone bill. The 365-day money-back guarantee means you can trial it for a full year before committing.