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Cyber Monday's best SIM-only deals

Will Georgiadis
29 Nov 2021
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These are our absolute favourite SIM-only deals of Black Friday and Cyber Monday

To help you out this Cyber Monday, we've compiled a list of the five best SIM-only deals we've found over the course of the Black Friday period.

For many of us, a great SIM-only deal means the maximum amount of data for the minimum monthly cost. But we've also included some deals below that simply offer unbeatably low monthly prices – if you're not a huge data hog, these may appeal to you. There are also contracts on our list that offer unusual extras, such as unlimited social media use or content streaming, or free subscriptions to services like BT Sport. We've tried to cater for all tastes.

Of course, you'll need to take into consideration the network running the deal: after all, the last thing you want is to be locked into a contract with a provider that doesn't offer the things you need. Fortunately, we review all of the major mobile network providers every year. We've used our experiences to help cherry-pick the absolute best SIM-only deals and prevent you from entering into a contract with a dud network. 

These are the best SIM-only deals of Black Friday and Cyber Monday.

1. Vodafone: 100GB for £10/mth


This is our favourite SIM-only deal of the Black Friday period: get 100GB of data on a 12-month contract from Vodafone for £10/mth, down from £14/mth. That's the price you'd ordinarily pay for a 20GB SIM-only plan from Vodafone, which helps contextualise the sheer insanity of this discount a little. In order to enjoy this offer to its fullest, you will need to claim cashback, but the retailer – Affordable Mobiles – explains how to do that once you make the purchase.

Buy now from Affordable Mobiles


2. Smarty: 4GB for £6/mth


Looking for the cheapest SIM-only deal of Black Friday and Cyber Monday? This £6/mth contract from Smarty fits the bill, offering you 4GB of data with unlimited calls and texts. It's a one-month contract, which makes it a strong alternative to a pay-as-you-go plan. Just be aware that it doesn't support 5G data connections.

Buy now from Smarty


3. Three: 100GB for £12/mth


As always, Three has come up trumps this Black Friday period with an astonishing high data, low-cost SIM-only deal. Its unlimited SIM is good value at £16/mth too, but we reckon 100GB is enough for the sweeping majority of users – and at £12/mth for 12 months, there's no arguing with the monthly cost. That's a 5G-ready SIM with unlimited minutes and texts.

Buy now from Three


4. VOXI: 50GB for £10/mth


If you're the sort that rather enjoys watching Squid Game on the morning commute or browsing Instagram in a coffee shop, Voxi (from Vodafone) is the network for you. With free, unlimited social media and streaming service usage that's completely unconnected from your main data contract, you won't have to worry about finding a hotspot ever again. Get 50GB of 5G-ready data for £10/mth this Cyber Monday.

Buy now from Voxi


5. O2: 250GB for £20/mth


Where to begin with this one? Aside from the 250GB of data and the low £20 monthly fee, this 24-month O2 SIM-only deal comes with a free six-month subscription to either Disney Plus, Amazon Prime Video, Amazon Music Unlimited, Audible, Calm or McAfee Mobile Security, plus a six-month Apple Music Plus subscription and free roaming in 75 countries worldwide. That's quite a platter of freebies.

Buy now from O2


If none of these contracts took your fancy, here's a quick list of some other cracking bargains on SIM-only plans we've found this Black Friday period:

In the mood for even more deals? Check out our main Black Friday and Cyber Monday hub for the latest discounts. If you want more SIM-only deals, check out our main page here.