To maximise the battery life of your phone, we recommend that you charge it fully before you use it. While it’s charging, make a note of the last six digits written on your SIM card – you’ll need these to set up a My3 account on your computer, if you haven't already got one.

Once it’s charged, put in your Three SIM card and turn your phone on. There will be an instruction guide in the box your phone came in that shows you how to do this.

If you’ve got a new iPhone or are upgrading from one iPhone to another, all you need to do is insert your SIM and switch your phone on. It'll take you through some steps to get you started.
Check out our iPhone support for more help.

You may not have a signal for the first few minutes when you turn on your phone. This is normal, but if you continue to have connection problems after a couple of hours, visit our signal & coverage support. 

If you need help setting up your phone, our device support provides information that’s specific to your phone in easy, step-by-step guides and videos. You can get to know the features of your phone, find out how to install apps, discover ways to keep your phone secure, and more.

If you’re moving from another network to Three and you want to keep your existing phone number, first you'll need to insert your new Three SIM into your phone and turn it on. Then you’ll need to let your old network provider know you're leaving and ask them for your PAC (Port Authorisation Code). When you’ve got your PAC you can fill in our online form and we’ll do the rest.

If you send your form before 5pm Monday-Friday (excluding bank holidays) your number should be moved during the next working day. If you send your form outside of these times, we’ll process your request as soon as we can on the next working day, and let you know by text and email when your number will be moved.

Checking your phone is 3G.

Please note that our SIM cards will only work in 3G phones. To check if yours is 3G, text ‘Mobile’ to 78333 (free).

Unlocking your phone.

If you bought your phone from another network it'll need unlocking and this is quick and easy to do. Just contact your current network for an unlocking code, known as a  DCK (Depersonalisation Control Key), and they'll give you instructions. You’ll find contact details for all networks here.

Transferring your contacts.

If you need to swap your SIM, you may want to make sure you’ve moved your contacts onto your phone before you take out your old SIM. Then you can transfer them to your new Three SIM when you’re ready. If you need help with this we have device support for all the phones we sell at Three, so it might be worth checking whether information is available for your particular phone.

Inserting your SIM into your phone.

If you need help putting your SIM into your phone you can check our device support to see if we’ve got information for your phone. Make a note of the last six digits on your SIM card before you put it into your phone – you’ll need these to set up a My3 account on your computer, if you haven't already got one.

Turning on your phone.

You may not have a signal for the first few minutes when you turn on your phone. This is normal, but if you continue to have connection problems after a couple of hours, visit our signal & coverage support. 

Getting the internet on your phone.

If you didn’t get your phone from Three you’ll need to set it up so that you can use the internet on our network. Set-up varies from phone to phone but you should be able to find information about yours in our device support.

Bringing your number to Three.

If you want to keep your existing phone number when you move to Three, first you'll need to insert your new Three SIM into your phone and turn it on. Then you’ll need to let your old network provider know you're leaving and ask them for your PAC (Port Authorisation Code). When you've got your PAC you can fill in our                         and we’ll do the rest.

There’s no need to enter all of your contacts manually. Moving your
contacts varies from phone to phone but you'll find help with this in our
device support.

To find out how to set up email accounts on your phone, visit our device support and select your phone.

If you're setting up your work email, you may need to enter the server and domain details as well - it's best to ask your IT department for help with this.

Your first bill will be higher than your usual monthly charge, as you’ll be charged for a month and up to eight days. This is so you can get connected as soon as you take your phone out of the box. But don’t worry - after the first month your bill will go back to normal.

You’ll be automatically set up to receive eBills, and we’ll send you a text message every month to let you know that your eBill is ready. You can see the full bill on your My3 account from your computer.

Your first bill after you've upgraded will summarise both your old and new packages (if you changed your package). It'll show you:

• an itemised summary of your previous month's usage
• a breakdown of your previous month's package and allowance of
your new package (if you changed your package), including any Add-ons or subscriptions
• any usage over or outside your monthly allowance last month
• any previous balance and any payments received
• a delivery charge if you upgraded to a new device online or over the phone
• a charge for an itemised paper bill if you still get them.

If you have more questions on your first bill, please visit  billing support.

Your My3 account makes it really easy to keep track of your spending. You can access it for free from your phone or computer. It helps you:

• check how much of your allowances you’ve got left each month

• view and print your bill

• update your personal details – like your home address, contact details and more

• top-up your credit if you're on Pay As You Go

Use your My3 account on your Three phone.

If you’ve got an iPhone or an Android phone you can download our Three app for easy access to your My3 account on the go. Just search for Three in either the App Store or Marketplace.

On all other phones it’s easy to get to your My3 account. Just go to Planet 3 (you’ll either see the Planet 3 icon on your homescreen or in Favourites) and select My3 account from the homepage. Alternatively, you can type mobile.three.co.uk into the internet browser on your phone.

Register to use your My3 account on a computer.

If you want to use My3 on a computer you’ll need to register first. To do this you’ll need to enter the last six digits written on your SIM card, so make sure you have it to hand. Please note that if you’ve just upgraded and you’ve previously set up a My3 account, you won’t need to do it again.