Yes — that is exactly what it is built for. Unlike voice-only call boosters, the D300 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 72 dB gain improves both at once, so calls stop cutting out and browsing, video and card-machine data get faster.

Yes. Virgin Mobile switched its UK service to EE's infrastructure from 2024, so Virgin SIMs now ride the same Band 3 (1800 MHz) voice and 4G frequencies as EE. The D300 amplifies that radio wave directly — just pop your existing Virgin SIM in your phone as normal. No new EE contract is required. BT Mobile, ASDA Mobile and legacy Orange / T-Mobile SIMs work the same way because they all use EE's network.

The D300 is the premium D-series model. It covers 300 m² versus the D250's 250 m², delivers 72 dB gain versus 70 dB, has a better ≤3.5 dB noise figure versus ≤4 dB, a 9 dBi Yagi outdoor antenna versus 8 dBi, and — most importantly — a 6 dBi panel directional indoor antenna versus the D250's 5 dBi omnidirectional antenna. It also supports up to 30 users versus 25. If you have a 3–4 bedroom house, large apartment or small office, the D300 is the better fit; for a smaller 2–3 bedroom home, the D250 is adequate.

A panel directional antenna focuses the boosted signal in one direction — at your living room, home office or shop floor — rather than wasting signal in all directions. For a 300 m² space with a defined main use area, a 6 dBi panel antenna delivers a stronger, more concentrated signal where you actually need it. If your use area is spread evenly in all directions from a central point, an omni might suit you better (that is the D250 approach).

Your 4G data will improve, but your 2G voice calls will not be boosted. The D300 amplifies Band 3 (1800 MHz), which Three uses for 4G LTE but not for 2G GSM voice (Three relies on 3G/4G calling and VoLTE). So Three, iD, SMARTY, Plusnet and Freedom Pop customers get faster 4G data, but do not get a traditional 2G voice-call boost. If voice reliability is your main problem and you are on Three, check whether VoLTE / Wi-Fi Calling is already enabled on your phone.

Yes. The D300 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 on the roof or chimney. 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 panel 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, crackle and dropped calls, and can disrupt the mast. Keeping the two antennas at least 10 m apart vertically (e.g. Yagi on the chimney roof, panel antenna on the ground floor or first floor) breaks that loop. The 10 m coax and AGC are designed around this separation rule.

Yes. The D300 supports additional indoor panel antennas, each covering roughly 100–150 m². You would fit a splitter at the booster unit and run extra coax to each panel antenna on a wall or ceiling. Each extra antenna and the splitter are sold separately. This is a good route if your home starts at 300 m² but has a garage annex, a home office outbuilding or a second floor that needs its own focused signal.

Plan on 1–2 hours for a full DIY install with a drill, masonry bit, ladder, cable ties and spanner. Mounting the Yagi on an exterior wall or pole at height is doable DIY if you are comfortable on a ladder. However, roof or chimney mounting — which gives the best line-of-sight to the EE mast — is recommended for a professional aerial installer, typically costing £80–150. The indoor panel antenna is simple wall or ceiling fixing once the coax is routed.

You are covered by a 365-day money-back guarantee, plus lifetime UK technical support. If the D300 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.