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Mobile Phone and SIM Top-Up

Online/Web Top-Up

Top-up your Three phone online with a basic top-up with low rates that don't expire. Or convert your credit into a great value Pay As You Go add-on which offers a bundle of minutes, texts and data that last for 30 or 90 days. Top-up can be done online with a debit or credit card, or alternatively using a voucher.

PlanRatesBuy Now
Basic Top-Up

3p a min

2p a text

1p a MB

Top Up >
Basic Top-Up
£10 add-on

4GB data

Unlimited mins

Unlimited texts

Top Up >
£15 add-on

10GB data

Unlimited mins

Unlimited texts

£20 add-on

12GB data

Unlimited mins

Unlimited texts

£27.50 add-on

36GB data

Unlimited mins

Unlimited texts

£35 add-on

Unlimited data

Unlimited mins

Unlimited texts

£90 add-on

(lasts for 90 days)

Unlimited data

Unlimited mins

Unlimited texts

Add-On Bundles (last for 30 days)

All minutes, text and data add-ons can be used in 71 destinations at no extra cost with Go Roam. However, when roaming abroad there is a fair usage policy of 15GB data per month in Go Roam Europe destinations and 12GB per month in Go Roam around the world destinations.

For even better value have you considered a Pay Monthly SIM plan, which are available on 1-month, 12-month or 12-month plans.

Mobile Broadband Top-Up

Top-up your mobile broadband dongle, MiFi device or tablet online with a basic top-up and pay for the data you use. Or choose a great value PAYG add-on with a bundle of data that lasts for 30 days. Top-up online can be done with a debit or credit card, or using a voucher.

Basic Top-Up£5 minimumTop Up >
500MB data bundle£2.99
1GB data bundle£10
3GB data bundle£15
7GB data bundle£25
Mobile Broadband Top-Up

When you buy an mobile broadband add-on you also benefit from Go Roam around the world enabling your data to be used in 71 countries.


Can I top-up on the phone?

Yes, simply call 444 from your Three phone and follow the instructions.

Can I top-up with a voucher?

Yes, you can buy a voucher from a high-street store and then activate it by dialing 444 on your Three phone.

Are there any other ways to top-up?

Yes, there are a number of alternatives for topping-up on Three.

  • Three App - Download the Three app from iTunes or Google Play
  • My3 Account - Login to your My3 Account to top-up using a voucher or debit/credit card. 
  • Phone - Dial 444 from a Three phone to top-up using a voucher or debit/credit card (registered first on My3)
  • Cash Machine - Top-Up at Barclays or HSBC cash machines if you have a card from Barclays, HSBC, Nationwide, The Coventry, Yorkshire or Clydesdale.
  • Top-up for someone else - Do an anonymous top-up for someone else here

How do I find my Three phone number?

There are a number of ways to find your mobile number

  • Android phones you can find your number in the following location: Settings - About Phone - Status
  • Apple iOS phones you can find your number in the following location: Settings - Phone
  • Mobile broadband devices go to http://3.home/ or when connected to your device

What are PAYG add-ons?

Add-ons are an enhanced version of Pay As You Go designed to offer better value for your money. Instead of simply using your credit to pay for usage you get a bundle of minutes, texts and data to use within 30 days.

If you're buying an add-on you'll first have to top-up and will then be able to convert your credit into an add-on.

In addition to the add-ons listed above there are also a few extra add-ons available:

  • 3000 Three-to-Three minutes for £5 which lasts for 30 days
  • Internet Daily Pass - 120MB data for £0.50 which lasts for 24 hours
  • Mobile Internet Pass - 500MB data for £5 which lasts for 30 days

Can I have more than one add-on active?

Yes. Add-ons can be combined where applicable. For example, you might have both a Three-to-Three add-on (giving you 3000 Three-to-Three minutes) and an All In One 10 add-on (giving you 1GB of data, 3000 minutes and 3000 texts).

In this case your Three-to-Three minutes would be used when calling someone else on Three, while your other allowances would be used the rest of the time.

Will an add-on be used before any credit?

Yes, if you have both an add-on and some ordinary credit the allowances from the add-on will be used first.

What don’t add-ons cover?

Add-ons don’t cover you making an international call, using your allowances abroad outside of Go Roam locations, using a text message shortcode service or calling a special number.

What happens when I use up my add-on?

If you have a second add-on queued then this will be activated automatically. If not, Three will send you a text when you’ve used up 80% of your add-on and another when you’ve used it up completely, so you’ll know you need to buy another or top up.

Can I top-up abroad?

Yes, although Three recommends doing so before you leave if possible. If you do need to top-up when abroad you’ll need to use a debit or credit card, as you won’t be able to buy a voucher. And remember, add-ons only work in Go Roam locations.


Trouble topping up? If you’re using a credit or debit card make sure it’s registered at the same address as you’re registered at Three with, that it hasn’t expired and that you’ve entered the security code correctly. Also, be sure you’ve got at least £10 in your account.

Issues with vouchers? Double check you’ve entered the correct voucher number and if all else fails turn your device off and on again.

No credit in your account? If you’ve topped up but can’t see the credit, wait an hour just in case there’s a delay. Or try turning your device off and on again.

Still no luck? If none of the above has helped you can always give Three a call on 333 from your Three phone for assistance.

View Pay As You Go Price Plan Guide >

The information contained on this website has been written to assist our readers. We do not represent Three or speak on its behalf and are entirely independent of Three.


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