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Cheapest Unlimited Data SIM Only Deals – Lowest Priced SIM Card Plans




SIM Only Best Deals


Unlimited Data SIM Only Best Deals


Bag yourself unlimited data every month for just £16 (inc VAT) with this limited time SIM card deal!

Enjoy unlimited calls and text messages as well as unlimited 5G data with this special offer SIM Only plan.

You’ll also benefit from ‘Roam Like Home’ throughout Europe as well as Australia and the USA!



Best Deals for Unlimited Data SIM Only









Can I use this SIM card plan in my existing phone?

Yes, so long as your phone is unlocked to all networks you can benefit from this unlimited data SIM only deal.


Is this unlimited SIM only deal 5G enabled?

Yes, so long as you have a 5G enabled phone and 5G coverage on Three in your area then you can enjoy superfast 5G speeds with this SIM only offer.


What if my phone is only 4G?

No problem, your phone will connect using 4G using this SIM card plan and you’ll still benefit from unlimited monthly data.


Can I keep my number?

Yes, simply text the word PAC to 65075 and your network will send back your PAC code within 60 seconds, call 333 from your new phone and give Three your PAC, they’ll transfer your number across for you the next working day.


What if I’m already on Three?

This special offer unlimited data SIM only deal is supplied with a new number, however you can easily keep your existing Three number by ‘Double Porting’…

Simply switch your Three number to a Pay As You Go SIM card on another network using the instructions above and then repeat the process switching back to your new Three unlimited data plan the next working day.

You can find full details and a step by step guide to ‘Double Porting’, here.




Compare the Cheapest SIM Only Deals







This heavily discounted SIM only plan is being offered by Three as an online exclusive via the Three Partner Channel.

This means that to find and order this deal on Three’s website, you’ll need to use the link on

This Three unlimited data SIM only special offer is not available on Three’s customer facing website, however using the link on directs you to your basket to checkout securely with Three on their website.

SIM cards for this unlimited data deal are dispatched by Three via Royal Mail.

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