All about ‘existing customer only’ mobile deals

ByKim Staples
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?

Plenty of operators offer deals for existing customers, including these ones:

Sky Mobile

Anyone can take out a Sky Mobile deal, but choosing this network is an especially good call for Sky TV customers - it comes with a few special extras. If you've got Sky TV, a Sky Mobile plan will give you:

  • Unlimited calls and texts - each household can register up to five Sky SIMs for these
  • Sky Go Extra, included free of charge
  • Sync, which lets you connect to your Sky TV box via your smartphone and manage your recordings

That's along with all the regular features of a Sky Mobile plan, like the ability to change your data allowance whenever you want and roll over any unused data from your allowance to use later. 

3GB data

Unlimited minutes

Unlimited texts 

£15.00 a month

12 months  

Get deal

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

3GB data

Unlimited texts

Unlimited minutes

Limited time offer!

£8.00 a month

£13.00 for non-BT customers

12 month contract

£40 Amazon or iTunes voucher

Get deal


Plusnet Mobile


6GB Data

2000 Minutes

Unlimited texts  

broadbandchoices exclusive!

£12.00  a month

30 day contract 


Get deal


2GB Data

1500 Minutes

Unlimited texts 


Mates rates!

£10.00  a month

30 day contract 

Get deal 



Three Mobile SIM

4GB data

Unlimited texts

Unlimited minutes

Usually £20.00

£18.00 a month

12 months

Get deal
Three iPhone deal

 4GB 4GB 4G data

Unlimited minutes

Unlimited texts

Normally £49  No upfront cost

£41.00 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.

Compare all mobile deals

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Find the perfect deal for you!