D250 vs C250 Signal Booster UK 2026: £169.00 EE Band 3 Voice+4G vs £199.99 O2 Vodafone Band 20 4G — Which Booster Is Right for Your Network?
The D250 and C250 both cover 250 m², but they are not interchangeable. The D250 at £169.00 is built for EE, BT Mobile and ASDA Mobile calls and 4G. The C250 at £199.99 is built for O2 and Vodafone 4G data. Pick by the SIM in your phone.
Verdict up front: the D250 at £169.00 and the C250 at £199.99 look like siblings on the spec sheet because both are rated for 250 m², but they are built for completely different mobile networks and they are not interchangeable. If your SIM is on EE, BT Mobile or ASDA Mobile, the D250 at £169.00 is the correct choice. If your SIM is on O2, Vodafone, giffgaff, Sky Mobile, Tesco Mobile, Lebara or Lycamobile, the C250 at £199.99 is the correct choice.
Buying the wrong one means you have spent good money on a box that will not light up your phone bars at all. The single most important fact in this entire comparison is that the D250 is tuned to Band 3 at 1800 MHz, where EE broadcasts both 2G voice calls and 4G LTE data, while the C250 is tuned to Band 20 at 800 MHz, where O2 and Vodafone broadcast 4G LTE data.
They cover the same 250 m² area. They sit in the same price neighbourhood. But the radio inside each unit is aimed at a different tower. This guide compares four products: the D250 at £169.00, the C250 at £199.99, the smaller C200 at £169.99, and the now-discontinued EE Femtocell or Sure Signal that many older EE customers still remember.
Why Two Boosters Share the 250 m² Name
When a shopper lands on a 250 m² booster page, the first question is usually which of the two 250 m² units to buy. The answer is not about which one is better in absolute terms. It is about which network your phone uses.
The D250 and the C250 are the same physical size class. Both are rated for 250 m² of indoor coverage. Both come with an 8 dBi outdoor antenna, a 10 m coaxial cable and a 240 V UK mains power supply. Both carry UKCA and CE certification and are Ofcom licence-exempt. The difference is entirely in the radio frequency they amplify.
The D250 listens to 1800 MHz. The C250 listens to 800 MHz. Your phone cannot be on both at once. EE phones talk to their tower on 1800 MHz. O2 and Vodafone phones talk to their 4G tower on 800 MHz. If you point a D250 at an O2 phone, the O2 phone will not see any boosted signal because the D250 is not listening to the frequency O2 uses. If you point a C250 at an EE phone, the EE phone will not see any boosted signal because the C250 is not listening to the frequency EE uses.
Head-to-Head Specification Comparison
Before we get into the economics, here is the full technical picture across all four products.
| Feature | D250 £169.00 | C250 £199.99 | C200 £169.99 | EE Sure Signal £0-100 |
|---|---|---|---|---|
| Product type | EE Band 3 voice + 4G | O2/Voda Band 20 4G | O2/Voda Band 20 4G | EE 3G femtocell |
| Frequency band | Band 3 1800 MHz | Band 20 800 MHz | Band 20 800 MHz | EE 3G over broadband |
| Max gain | 70 dB | 72 dB | 70 dB | n/a, femtocell |
| Output power | 20 dBm | 20 dBm | 17 dBm | n/a |
| Noise figure | ≤4 dB | ≤4 dB | ≤5 dB | n/a |
| Coverage area | 250 m² | 250 m² | 200 m² | 10-15 m² |
| Voice calls supported | Yes, 2G Band 3 | No, 4G only | No, 4G only | Yes, 3G only |
| 4G data supported | Yes, Band 3 LTE | Yes, Band 20 LTE | Yes, Band 20 LTE | No, 3G only |
| UK networks | EE, BT Mobile, ASDA, Orange/T-Mobile | O2, Vodafone, giffgaff, Sky, Tesco, Lebara, Lyca | O2, Vodafone, giffgaff, Sky, Tesco | EE only |
| Outdoor antenna | 8 dBi Yagi directional | 8 dBi dual panel | 7 dBi omni | None, uses broadband |
| Indoor antenna | 5 dBi omni | 5 dBi omni | 5 dBi omni | Built into unit |
| Cable | 10 m coax, upgrade 20 m | 10 m coax, upgrade 20 m | 10 m coax | Ethernet to router |
| Power consumption | ≤12 W | ≤12 W | ≤10 W | 8 W |
| Simultaneous users | Up to 25 | Up to 25 | Up to 20 | Up to 4 |
| Unit size / weight | 180×130×30 mm / 400 g | 180×130×30 mm / 450 g | 180×130×30 mm / 380 g | 150×150×30 mm / 300 g |
| Certification | UKCA/CE, Ofcom exempt | UKCA/CE, Ofcom exempt | UKCA/CE, Ofcom exempt | EE supplied, discontinued |
The D250 Is £30.99 Cheaper and Does More
The C250 costs £199.99. The D250 costs £169.00. That is a £30.99 price gap in favour of the D250. And the D250 is not cheaper because it is worse. It is cheaper because Band 3 1800 MHz RF components are slightly less expensive than Band 20 800 MHz dual-panel components in 2026.
More importantly, the D250 does more. It amplifies both voice calls and 4G data. The C250 amplifies 4G data only. If you are on EE and your problem is dropped calls, the C250 will not fix your calls because it does not amplify the voice frequency EE uses. It might improve your 4G data if your phone happens to camp on a Band 3 data carrier that overlaps, but in practice EE voice on 1800 MHz is invisible to a Band 20 800 MHz box.
The C250's 2 dB Advantage Is Narrow
The C250's 72 dB of gain is 2 dB higher than the D250's 70 dB. That 2 dB is a marginal advantage that only shows up at the very edge of the coverage bubble in a weak-signal rural location. It does not make the C250 a better general-purpose purchase. It makes the C250 a better purchase for O2 and Vodafone customers who need that extra 2 dB to pull in a distant 800 MHz tower.
The C200 at £169.99: The Smaller Sibling
The C200 sits at £169.99, which is 99 pence more than the D250 at £169.00. It is easy to glance at the two prices and assume they are the same tier. They are not.
The C200 is a Band 20 800 MHz 4G data booster for O2 and Vodafone, rated for 200 m² rather than 250 m², with 70 dB of gain, 17 dBm output and a 7 dBi omni outdoor antenna instead of the C250's 8 dBi dual panel. It is a solid unit for a two or three bedroom house on O2 or Vodafone where you only need data speeds improved and you do not have a rural-signal problem.
But it will not help an EE customer at all. If you are on EE, the 99 pence price difference between the D250 at £169.00 and the C200 at £169.99 is irrelevant, because the C200 is tuned to the wrong network.
The EE Sure Signal Is Dead. Long Live the D250.
If you are an EE customer over the age of about ten years of home ownership, you may remember the EE Sure Signal. It was a small white box that plugged into your home broadband router and created a 3G mobile hotspot inside your house. It worked, but it had three big limitations.
First, it only covered 10 to 15 m², roughly one room. Second, it depended entirely on your home broadband connection, so if your broadband dropped your calls dropped too. Third, EE discontinued it several years ago and will not send replacements.
The D250 is the modern over-the-air replacement for the Sure Signal. It does not plug into your broadband. It pulls in the existing EE mobile signal from outside your house and rebroadcasts it inside at 250 m². It supports 2G voice and 4G data on Band 3 1800 MHz. It supports up to 25 simultaneous users. It is £169.00 one time with no monthly fee.
Price, Coverage, Network and Function Value Table
The table below lines up every product on the four dimensions shoppers actually care about: what you pay, how much area you cover, which networks it serves, and what functions it performs.
| Dimension | D250 £169.00 | C250 £199.99 | C200 £169.99 | Sure Signal 2nd hand |
|---|---|---|---|---|
| Upfront price | £169.00 | £199.99 | £169.99 | £0-£100 |
| Coverage | 250 m² | 250 m² | 200 m² | 10-15 m² |
| Voice calls | Yes | No | No | Yes, 3G only |
| 4G data | Yes | Yes | Yes | No |
| Supported networks | EE, BT, ASDA | O2, Voda, giffgaff, Sky, Tesco, Lebara, Lyca | O2, Voda, giffgaff, Sky, Tesco | EE only |
| Monthly fee | None | None | None | None, but discontinued |
| Installation time | 30-60 min DIY | 30-60 min DIY | 30-60 min DIY | Plug into router |
| 5-year electricity | £17.52 | £17.52 | £14.60 | £11.68 |
| Realistic 5-year cost | £186.52 | £217.51 | £184.59 | £111.68, unsupported |
The D250 and the C200 land within £2 of each other on five-year cost, but they deliver to different networks. The C250 is £30.99 more expensive than the D250 upfront, and that premium buys the extra 2 dB of gain and the dual-panel antenna for O2 and Vodafone Band 20 conditions. The Sure Signal looks cheapest but it is discontinued, unsupported, 3G-only and covers one room.
Honest Pros and Cons of Each Product
| Product | Pros | Cons |
|---|---|---|
| D250 £169.00 | Pro 1: The only UK booster tuned to EE Band 3 1800 MHz for both voice and 4G at this price. Pro 2: 250 m² coverage matches a 3-4 bed home, small shop or pub. Pro 3: 8 dBi Yagi directional antenna points at the EE tower and rejects interference. Pro 4: £30.99 cheaper than the C250 despite covering the same area. Pro 5: UKCA/CE certified, Ofcom licence-exempt, AGC equipped. |
Con 1: Will not work on O2, Vodafone, Three, iD, Smarty or Plusnet. Con 2: Requires at least one bar of outdoor EE signal at the antenna. Con 3: No smartphone app or LCD, LED status only. Con 4: 10 m vertical separation between antennas required. |
| C250 £199.99 | Pro 1: 72 dB gain is 2 dB higher than the D250, useful for weak rural O2/Voda signal. Pro 2: 8 dBi dual-panel outdoor antenna is excellent for Band 20 800 MHz. Pro 3: 250 m² coverage matches a 3-4 bed home. Pro 4: Supports the full O2 and Vodafone MVNO roster. Pro 5: UKCA/CE certified, Ofcom licence-exempt. |
Con 1: 4G data only, no voice call improvement. Con 2: £30.99 more expensive than the D250. Con 3: Will not work on EE at all. Con 4: Dual-panel antenna is bulkier on the chimney. |
| C200 £169.99 | Pro 1: Only £0.99 more than the D250. Pro 2: 200 m² coverage is fine for a 2-3 bed O2/Voda home. Pro 3: 70 dB gain is adequate for suburban signal. Pro 4: UKCA/CE certified. |
Con 1: 200 m² rather than 250 m², leaves rear rooms on the edge. Con 2: 17 dBm output is lower than the D250 and C250. Con 3: 7 dBi omni antenna cannot be pointed at a distant tower. Con 4: Will not work on EE. |
| EE Sure Signal | Pro 1: No external antenna installation. Pro 2: Works over existing broadband. Pro 3: Small and unobtrusive. |
Con 1: Discontinued by EE, no replacements. Con 2: 10-15 m² coverage is one room only. Con 3: Depends on home broadband, so broadband drops equal call drops. Con 4: 3G only, no 4G data. Con 5: Second-hand units may fail with no warranty. |
How to Choose in 30 Seconds
If you do not want to read the whole comparison, follow this five-step checklist.
Step one: look at the SIM card in your phone.
Step two: if it says EE, BT Mobile or ASDA Mobile, buy the D250 at £169.00.
Step three: if it says O2, Vodafone, giffgaff, Sky Mobile, Tesco Mobile, Lebara or Lycamobile, and you need 4G data, buy the C250 at £199.99 for 250 m² or the C200 at £169.99 for 200 m².
Step four: if it says Three, iD Mobile or Smarty, none of these four products will help you, and you need a different band booster.
Step five: if you live in a flat and the Sure Signal was your old solution, the D250 is the modern replacement, but only if you are on EE.
Final Verdict by Scenario
EE Customer in a 250 m² Home
Buy the D250 at £169.00. It is the correct network, the correct band, the correct coverage and the correct price.
O2 Customer in a 250 m² Home Needing Faster 4G
Buy the C250 at £199.99. The extra 2 dB and dual-panel antenna are worth the £30.99 if you are in a weak-signal area.
Vodafone Customer in a 250 m² Home Needing Faster 4G
Buy the C250 at £199.99. Same logic as O2. Vodafone Band 20 800 MHz is exactly what the C250 amplifies.
You Need Voice plus 4G on EE
The D250 at £169.00 is the only one of the four products that does both. The C250 and C200 are data-only. The Sure Signal is voice but 3G-only and discontinued.
You Only Need 4G Data on O2 or Vodafone
The C250 at £199.99 is the 250 m² option. If your home is under 200 m² the C200 at £169.99 saves you £30.99.
Budget Is Tight and You Are on EE
The D250 at £169.00 is the cheapest legitimate EE Band 3 solution on the UK market.
Small Commercial Shop or Pub on EE
Buy the D250 at £169.00. Up to 25 users, 250 m², voice and 4G.
Mixed-Network Household
If one person is on EE and another is on O2, you cannot fix both with one box. You would need a D250 for the EE phone and a C250 for the O2 phone, which is usually not worth it. Solve the network that causes the most pain first.
The Bottom Line: The D250 at £169.00 and the C250 at £199.99 are the same size class, the same 250 m² coverage, the same build quality and the same Ofcom-legal status. They differ in exactly one important way: the D250 is tuned to Band 3 1800 MHz for EE, BT Mobile and ASDA Mobile voice plus 4G, and the C250 is tuned to Band 20 800 MHz for O2 and Vodafone 4G data. There is no universally better one. The right choice is determined entirely by which SIM is in your phone. EE buyers should reach for the D250 at £169.00, which is also £30.99 cheaper and adds voice calling on top of 4G data. O2 and Vodafone buyers should reach for the C250 at £199.99, which trades the voice capability for an extra 2 dB of gain and a dual-panel antenna on the data-only Band 20 signal. The C200 at £169.99 is the budget 200 m² option for O2 and Vodafone. The EE Sure Signal is discontinued and should be replaced by the D250.
Frequently Asked Questions
What is the difference between the D250 and C250 signal boosters?
The D250 at £169.00 is tuned to Band 3 1800 MHz for EE, BT Mobile and ASDA Mobile, and it amplifies both 2G voice calls and 4G LTE data. The C250 at £199.99 is tuned to Band 20 800 MHz for O2 and Vodafone, and it amplifies 4G LTE data only. Both cover 250 m².
Which is cheaper, the D250 at £169.00 or the C250 at £199.99?
The D250 at £169.00 is cheaper by £30.99. Despite being cheaper, the D250 also does more, because it amplifies voice calls in addition to 4G data.
Does the D250 support voice calls while the C250 does not?
Yes. The D250 amplifies EE 2G voice calls on Band 3 1800 MHz. The C250 is a 4G-data-only booster on Band 20 800 MHz and will not improve voice call quality on any network.
I am on EE, should I buy the D250 or the C250?
Buy the D250 at £169.00. The C250 is tuned to Band 20 800 MHz which EE does not use for calls or data. The C250 will not improve your EE signal at all.
I am on O2, which booster do I need?
If you need faster 4G data across 250 m², buy the C250 at £199.99. If your home is under 200 m², the C200 at £169.99 is the cheaper option. Both amplify O2 Band 20 800 MHz 4G. The D250 will not work on O2.
I am on Vodafone, which booster do I need?
Buy the C250 at £199.99 for 250 m² or the C200 at £169.99 for 200 m². Vodafone uses Band 20 800 MHz for 4G, which is exactly what the C250 and C200 amplify.
Why is the C200 at £169.99 cheaper than the C250?
The C200 covers 200 m² rather than 250 m², has 70 dB gain rather than 72 dB, 17 dBm output rather than 20 dBm, and a 7 dBi omni antenna rather than an 8 dBi dual panel. It is the budget O2 and Vodafone option for smaller homes.
What happened to the EE Sure Signal, is the D250 a replacement?
EE discontinued the Sure Signal, which was a 3G femtocell that ran over your home broadband and covered about one room. The D250 is the modern over-the-air replacement: it pulls in EE signal from outside, covers 250 m², supports 2G voice and 4G data, and does not depend on your broadband.
Do the D250 and C250 cover the same size area?
Yes. Both are rated for 250 m² of indoor coverage. They are the same physical size class. The difference is the network they serve, not the area they cover.
Can the D250 and C250 both work in the same house?
Technically yes, but it is almost never worth it. You would need two outdoor antennas, two indoor antennas and two power supplies, and you would only do this if one household member is on EE and another is on O2 or Vodafone and both suffer from poor indoor signal. For most mixed-network households, solving one network well is the better trade.
Learn More: EE Signal Booster Guides
Best EE Signal Booster 250 m² UK — Buyer's Guide
How to choose the right EE home booster for a 3–5 bedroom house, and why Band 3 1800 MHz matters.
D250 vs C250 — Which Booster Do You Actually Need?
EE Band 3 voice + 4G vs O2/Vodafone coverage — how to pick the right network-specific unit.
How to Improve EE Signal at Home — UK Steps
Yagi aiming, antenna separation and coax routing to fix dropped calls and slow rural 4G.
EE, BT Mobile & ASDA 4G Booster — What Works on EE
Which UK MVNOs ride EE, and how a Band 3 1800 MHz booster fixes calls and data for all of them.
