HONOR 400 Smart

5G SA

In stock

Order by midnight for free next-working-day home delivery

Meet HONOR 400 Smart. Featuring a 6.77-inch LCD display, durable IP54 protection, all-day performance with 35W fast charging, and a 50MP main camera for clear, vibrant shots.

Looking for the HONOR 400 Lite?

Looking for the Honor 400 Pro?

Looking for the HONOR Magic V5?

Pay Monthly contracts and deals

Pick a pre-built plan

Customise your plan

Are you a Virgin Media broadband customer?

Get double data, boosted broadband speeds, and more when you’re with both Virgin Media and O2.

15GB

Plus plan

36 month contract

Upfront

.41

MONTHLY

From Apr 2026 bill £33.91

From Apr 2027 bill £36.41

Monthly cost breakdown:

£4.42 Device +£26.99^† Airtime

50GB

Plus plan

36 month contract

Upfront

.41

MONTHLY

From Apr 2026 bill £36.91

From Apr 2027 bill £39.41

Monthly cost breakdown:

£4.42 Device +£29.99^† Airtime

200GB

Plus plan

36 month contract

Upfront

.41

MONTHLY

From Apr 2026 bill £41.91

From Apr 2027 bill £44.41

Monthly cost breakdown:

£4.42 Device +£34.99^† Airtime

Choose your Extra

Get up to six months' Disney+ or another Extra, on us

Data rollover

Take last month's unused data from your main allowance into the next. Included with Plus and Ultimate Plans.

Get more out of life

With extra benefits for being with both Virgin Media and O2

Features

Tech specs

50 MP

Camera

35W

Charging Times

Data Connectivity

6.77 inch

Screen Size

Overall

Battery

6500mAh

Dimensions (mm)

166.89 mm (length) x 76.8 mm (width) x 8.39 mm (height)

Expandable Storage

Facial Recognition

Yes

Fingerprint Recognition

Yes

Internal Storage (GB)

128GB

Water Resistance (IP Rating)

IP54

Operating System

Android

Processor

Qualcomm SM6375Pro

Resolution

1610 x 720

Screen Size (inches)

6.77 inch

Standby Time (hrs)

792

Talk Time (hrs)

Type of Display

LCD

Weight (g)

206g

Connectivity

Band Type

NR/LTE TDD/FDD-LTE/WCDMA/GSM

Bluetooth

Yes

Network Technology

5G SA

Dual SIM

Yes

Fast Charging

35W

NFC

Yes

SIM Type (Nano etc)

Nano

Type of Audio Connector

USB-C

Type Of Charger Connector

USB-C

Wi-Fi

Yes

Wi-Fi and 4G Calling

Yes

Wireless Charging

Entertainment

Audio

2 Speakers

Flash

Main

Front Camera (MP)

5MP

Rear Camera (MP)

50MP

Why O2?

A network you can trust

We're here for you whenever you need us. So you can stay connected to the people that matter.

Get Priority

From unique prize draws to unforgettable moments. Priority gives you invite-only access to gigs, perks and experiences.

My O2

Check your bill, view your balance, add Bolt Ons and more. Anytime, anywhere.

A network you can trust

We're here for you whenever you need us. So you can stay connected to the people that matter.

Get Priority

From unique prize draws to unforgettable moments. Priority gives you invite-only access to gigs, perks and experiences.

My O2

Check your bill, view your balance, add Bolt Ons and more. Anytime, anywhere.

1 COLOUR

HONOR

400 Pro

4.7

5G ready

.00

Upfront

.61 †

A month

£18.61 Device +

£26.00 * Airtime

36 month Device Plan.

Monthly rolling Airtime Plan.

OFFER

1 COLOUR

HONOR

200 Smart

3.7

5G ready

Save up to £66. While stocks last.

.00

Upfront

.06 †

A month

£2.06 Device +

£23.00 * Airtime

36 month Device Plan.

Monthly rolling Airtime Plan.

1 COLOUR

HONOR

400 Lite

3.9

5G ready

.00

Upfront

.67 †

A month

£6.67 Device +

£26.00 * Airtime

36 month Device Plan.

Monthly rolling Airtime Plan.

FAQs

When was HONOR 400 Smart released?

It was released on 29 August, 2025 and available to buy now at O2. Spread the cost on a Pay Monthly plan.

What are the HONOR 400 Smart specs?

HONOR 400 Smart features a 6.77-inch LCD display with a 1610x720 resolution. Enjoy smooth performance for everyday apps, powered by Qualcomm SM6375Pro and 4GB RAM. 128GB storage offers plenty of room for apps, photos, and videos.

What is the HONOR 400 Smart battery life like?

Stay powered up all day and beyond. Packed with a massive 6500mAh battery to deliver up to 51 hours talk time and 792 hours on standby. Plus, support for 35W fast charging via USB-C.

What colours are available?

Choose from two stunning finishes in Velvet Black or Meteor Silver.

Is HONOR 400 Smart waterproof?

No, it's not. The IP54 waterproof rating offers some protection for dust and water such as splashes and rain.

What SIM is compatible with HONOR 400 Smart?

It supports two nano-SIM cards, letting you manage two numbers on one device.

What is the HONOR 400 Smart price?

Choose from a range of HONOR 400 Smart Pay Monthly contracts, from pre-built plans to flexible ones to match your lifestyle. Access O2 perks like Priority gig tickets, exclusive offers, and O2 Extras.

Go to help and support

The legal bit

Custom plans

Direct purchases only. Pay the cash price for your device or spread the cost over 3 to 36 months (excludes dongles). Certain device costs available to be spread over 3 to 48 months. The cost of your Device will be the same however long you choose. There may be an upfront cost. For customers who took out an O2 Refresh custom plan on or after 17 December 2021, your Airtime Plan and Device plans unlink after 24 months. This means that if you are in the first 24 months of your Device Plan you will have to pay off your Device Plan in full if you decide to end your Airtime Plan. After 24 months you can: keep your Airtime and Device Plans without changing anything Cancel your Airtime Plan and keep paying off your Device Plan instalments or, Cancel your Airtime Plan and pay off your Device Plan in full. For customers who took out an O2 Refresh custom plan before the 17 December 2021 the Airtime and Device Plans remain linked for the duration of the Device Plan, this means you will have to pay off your Device Plan in full if you decide to end your Airtime Plan at any point.

UK calls/texts to standard UK landlines and mobiles and when roaming in our Europe Zone. Fair Usage policy applies. Special and out of bundle numbers chargeable. 4G phone required to access 4G. 4G available in selected areas.

Change your airtime tariff after 30 days and then once every billing month during your minimum contract period, choosing from a selected family of tariffs. Some tariff extras are only available on the starting tariff, are not transferable, and may be lost if you change to an ineligible tariff. Devices are subject to availability.

0% APR. Finance subject to status and credit checks, 18+, Direct Debit. Credit provided by Telefonica UK Ltd, 500 Brook Drive, Reading, RG2 6UU, UK. Terms apply, see o2.co.uk/terms.

Get Unlimited Data

Unlimited Data available on O2 Custom Plans on selected handsets and selected SIM Only tariffs. Fair use policy applies, personal and non-commercial usage only. This policy asks that you only use our services or SIM cards for private, personal and legitimate consumer purposes, and not for business purposes. See more at www.o2.co.uk/fair-usage-policy. If you regularly use 650GB of data per month or tether 12 or more devices we may consider this to be non permitted use and have the right to move you to a more suitable plan. EU roaming capped at 25GB per month. For full terms see www.o2.co.uk/terms.

*Subject to Annual Price Increase

Monthly price of your Airtime Plan will increase by £2.50 each April, except Data Only and Smartwatch Plans which will increase by 75p. Out of bundle charges increase by 5% every 1 April.

Your Custom Plan - Representative Example

Duration of Device Plan: 36 months
Monthly device payment: £4.42
Credit amount: £159.00
Interest rate (fixed): 0%
Representative APR: 0%
Upfront cost: £10.00
Total amount payable for device: £169.00
Cash price: £169.00

Direct purchases only. Pay the cash price for your device or spread the cost over 3 to 36 months (excludes dongles). Certain device costs available to be spread over 3 to 48 months. The device cost will be the same whatever you choose. There may be an upfront cost. You can pay off your Device Plan at any time and choose to keep your Airtime Plan, upgrade it, or leave. If you are in the first 24 months of your Device Plan and you cancel your Airtime Plan you will have to pay the remainder of your Device Plan in full. After 24 months you can keep your Airtime Plan, upgrade it, or end it without affecting your Device Plan.

Plans unlink after 24 months

For customers who took out an O2 Refresh custom plan on or after 17 December 2021, your Airtime Plan and Device plans unlink after 24 months. This means that if you are in the first 24 months of your Device Plan you will have to pay off your Device Plan in full if you decide to end your Airtime Plan (but we won’t charge you an Early Termination Charge to exit your Airtime Plan).

After 24 months you can: keep your Airtime and Device Plans without changing anything, Cancel your Airtime Plan and keep paying off your Device Plan instalments or, Cancel your Airtime Plan and pay off your Device Plan in full. For customers who took out an O2 Refresh custom plan before the 17 December 2021, the Airtime and Device Plans remain linked for the duration of the Device Plan, this means you will have to pay off your Device Plan in full if you decide to end your Airtime Plan at any point (but we won’t charge you an Early Termination Charge to exit your Airtime Plan).

HONOR 400 Smart

5G SA