Yes — that is exactly what it is built for. Unlike voice-only call boosters, the D250 boosts Band 3 (1800 MHz), which EE uses for both 2G voice calls and 4G LTE data. The same weak outdoor signal that causes dropped calls also throttles your 4G; the 70 dB gain improves both at once, so calls stop cutting out and browsing, video and card-machine data get faster.

Yes. BT Mobile and ASDA Mobile both run on EE's own network infrastructure, so they use exactly the same Band 3 (1800 MHz) voice and 4G frequencies. Just pop your existing BT Mobile or ASDA SIM in your phone as normal — the D250 amplifies the radio wave either carrier rides on. No new EE contract is required. Legacy Orange and T-Mobile SIMs also work because they merged into EE.

Typically it moves from around 1–5 Mbps with a weak signal up to about 10–30 Mbps with a good boosted signal. Treat that as a guide, not a guarantee: the booster improves the radio link between your phone and the mast, but your final speed is also set by how busy the EE mast is and its backhaul. A quiet rural mast will give better results than a congested town mast.

Yes. The D250 amplifies an existing weak donor signal — it cannot create signal from nothing. Before buying, check EE signal on your phone outside, near where the Yagi will sit. If you have at least 1–2 bars of Band 3 signal outdoors, the booster can push a full-strength signal inside. If you show zero bars and emergency-only outside, no Ofcom-legal booster at this price will help.

If the indoor antenna leaks the boosted signal straight back into the outdoor Yagi, the amplifier feeds itself a loop and goes into self-oscillation — that causes noise, dropped calls and can disrupt the mast. Keeping the two antennas at least 10 m apart vertically (e.g. Yagi on the chimney roof, indoor antenna on the ground floor) breaks that loop. The 10 m coax and AGC are designed around this separation rule.

No. The D250 is tuned to Band 3 (1800 MHz), the EE voice and 4G band. O2, Vodafone and Three run their services on different frequencies, so the D250 cannot amplify them. It also will not help Three-hosted iD Mobile or SMARTY. If you are on O2 or Vodafone you need a different Band 20 / Band 8 unit; if you are on EE, BT Mobile or ASDA Mobile, the D250 is the right fit.

Yes, for a typical 3–5 bedroom home, small office, shop or pub. 250 m² (about 2,691 ft²) covers an average detached or semi-detached house across two floors. It is not designed for very large homes, barn conversions, multi-storey commercial buildings or estates over 250 m² — those need a higher-coverage unit. For a standard family home, expect good signal in most rooms once the indoor antenna is placed centrally.

Plan on 30–60 minutes and a drill, screwdriver, spanner and a sturdy ladder. You drill to fix the Yagi bracket to the wall, pole or chimney at 3–5 m, run the 10 m coax indoors, mount the indoor antenna, and plug the 240 V adapter into a mains socket. If you are not comfortable working at height on a ladder, use a local handyman or aerial installer — the kit is standard and simple for them to fit.

Yes — that is one of the intended use cases. The D250 supports up to 25 simultaneous users, so multiple staff phones, a card machine, a booking tablet and customer phones on EE, BT Mobile or ASDA Mobile all get a better signal at once. The 250 m² footprint suits a single-floor shop, salon or pub bar. For multi-room pubs or larger trading floors, check whether 250 m² covers your actual floor area.

You are covered by a 365-day money-back guarantee, plus lifetime UK technical support. If the D250 does not improve your EE calls or 4G after a proper install (correct Yagi aim, 1–2 bars outdoors, ≥10 m antenna separation), contact support and you can return it by mail for a free return and refund. Free UK delivery takes 10–15 working days after 1–2 days order handling, so order early if you have an urgent deadline.