All about ‘existing customer only’ mobile deals

Girl on pile of smartphones

Most mobile deals are available to anyone, but others have an elite-looking label on them that says they’re for ‘existing customers only’. But what does that mean? And are they any good?

What are existing customer deals?

Some providers like to say thank you for customer loyalty, and one of the ways they do that is by giving you a discount when you get another service from them. In the case of mobile deals, that usually means a lower monthly rate for current customers who sign up to a new one.

For instance, if you're coming to the end of a mobile plan, there may be exclusive customer only deals available to encourage you to stay on that network. Or, a provider that offers multiple services - like broadband and home phone - may give a discount on mobiles to its current broadband customers.

You'll sometimes find them for contract deals on handsets, but most of the time they're SIM-only plans.

Existing customer deals come with a few advantages:

  • They're a lot cheaper
  • Some of them are completely exclusive to customers, and not available otherwise
  • You can incorporate them into your usual monthly bills

There's often more limited choice on handsets and tariffs, but if you find a deal you want, it's almost certainly going to be fantastic value.

Which providers have existing customer deals?

BT Mobile

SIM-only deals on BT Mobile are available to anyone, but if you're a BT broadband customer, they'll cost you a lot less. They also have the advantage of wide 4G coverage and free access to public Wi-Fi hotspots.

Browse BT Mobile SIM-only deals

BT Mobile SIM

15GB data

Unlimited texts

Unlimited minutes


£16.00 a month

£25.00 £21.00 a month for non-BT customers

12 months

£80 Amazon/iTunes gift card

Get deal



TalkTalk mobile

Mobile deals from TalkTalk are only available to customers who have a broadband, home phone, or TV package. You can either add a mobile deal to your existing plan, or include a SIM when you first sign up to TalkTalk broadband. There are 30-day contracts available, as well as SIMs with unlimited data, minutes, and texts. Contracts on handsets are pretty wide-ranging, and include flagships like iPhones and the Samsung Galaxy S6

Read more about TalkTalk mobile

Samsung Galaxy J3

150MB 300MB data

300 minutes

250 texts


£8.75 a month for 12 months

24 months, existing TalkTalk customers only

See deal
TalkTalk Mobile SIM only

700MB 2.1GB data

1000 minutes

Unlimited texts


£7.75 a month

12 month contract

See deal




Three Mobile SIM

4GB data

Unlimited texts

Unlimited minutes

Usually £21.00

£19.00 a month

12 months

Get deal
Three iPhone deal

4GB 4G data

Unlimited minutes

Unlimited texts

Normally £49  No upfront cost

£39.00 a month

24 month contract

Get deal


How do I sign up?

1. Search our site for deals that suit you. Try our SIM-only plans, or find your provider on our list of networks to see what they have to offer.

2. Select the deal you like the look of. You'll be directed straight to the provider's website.

3. For an existing customer only deal, you'll be asked to enter your account details. Have your login info at the ready.

4. If everything is above board, you're ready to order your plan! Sign up to the deal, and your SIM should be on its way.

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