The Best SIM Only Deals for May 2021

Top SIM Only deals for  May 2021

Everyone wants a good deal when choosing a new SIM contract but with so much choice it can be confusing. It is important to choose the right plan for you - especially if you're about to commit to a 12 month deal. 

We know cost is one of the biggest factors in choosing a new deal so we have compared offers across various price points. Simply decide how much you want to spend and compare deals from the top UK networks. 

It is worth noting that around 50% of UK mobile consumers use up to 5GB data a month. and call and text usage is actually falling. For around £10 you can easily cover these requirements. Consider your own mobile phone use before you buy; it's not worth paying extra for allowances you won't use.

SIM deals under £10

Without the repayments for a phone included in the monthly bill, SIM only deals can be incredibly low cost – starting from as little as £5 per month. Though you won’t find many £5 deals from all the big mobile networks Three are pretty active, and there is plenty on offer from the smaller Mobile Virtual Network Operators like giffgaff and Tesco Mobile, who both use O2’s network, or Virgin Mobile on EE.

1 100GB 12 month Vodafone SIM Only

100GB 12 month Vodafone SIM Only

12 month Vodafone SIMO | 100GB data | Unlimited texts and calls
2 60GB 12 month Vodafone SIM Only

60GB 12 month Vodafone SIM Only

12 month Vodafone SIMO | 60GB data | Unlimited texts and calls
3 50GB 12 month iD Mobile SIM Only

50GB 12 month iD Mobile SIM Only

12 month iD Mobile SIMO | 50GB data | Unlimited texts and calls
4 30GB 12 month Three SIM Only

30GB 12 month Three SIM Only

12 month Three SIMO | 30GB data | Unlimited texts and calls
5 30GB 12 month iD Mobile SIM Only

30GB 12 month iD Mobile SIM Only

12 month iD Mobile SIMO | 30GB data | Unlimited texts and calls

SIM deals from £10

You can get some surprisingly good value deals for around £10 from some of the bigger networks. 

1 Unlimited 12 month Vodafone SIM Only

Unlimited 12 month Vodafone SIM Only

12 month Vodafone SIMO | Unlimited texts, minutes and data
2 Unlimited 12 month Three SIM Only

Unlimited 12 month Three SIM Only

12 month Three SIMO | Unlimited texts, minutes and data
3 Unlimited 12 month iD Mobile SIM Only

Unlimited 12 month iD Mobile SIM Only

12 month iD Mobile SIMO | Unlimited texts, minutes and data
4 100GB 12 month Three SIM Only

100GB 12 month Three SIM Only

12 month Three SIMO | 100GB data | Unlimited texts and calls
5 100GB 12 month TalkMobile SIM Only

100GB 12 month TalkMobile SIM Only

12 month TalkMobile SIMO | 100GB data | Unlimited texts and calls

SIM deals from £20

1 Unlimited 12 month Virgin Mobile SIM Only

Unlimited 12 month Virgin Mobile SIM Only

12 month Virgin Mobile SIMO | Unlimited texts, minutes and data
2 Unlimited 12 month Tesco Mobile SIM Only

Unlimited 12 month Tesco Mobile SIM Only

12 month Tesco Mobile SIMO | Unlimited data | 5000 texts | 5000 minutes
3 Unlimited 12 month IQ Mobile SIM Only

Unlimited 12 month IQ Mobile SIM Only

12 month IQ Mobile SIMO | Unlimited texts, minutes and data
4 Unlimited 12 month O2 SIM Only

Unlimited 12 month O2 SIM Only

12 month O2 SIMO | Unlimited texts, minutes and data
5 250GB 12 month O2 SIM Only

250GB 12 month O2 SIM Only

12 month O2 SIMO | 250GB data | Unlimited texts and calls

Why choose SIM Only

SIM only plans are available from most of the major UK networks and MVNOs. A well chosen SIMO plan can bring substantial discounts on your annual smartphone costs. You can even add get low-cost extra lines for family members.

A SIM-only plan is essentially a contract just for sms messages, minutes and data. Because the plan doesn’t include a phone it is much, much cheaper. There are a wide range of SIM Only tariffs available, with the best prices usually only found online. You can find and compare the best plans here at WhatSIM.co.uk.

Standard Mobile Phone contracts include a smartphone. This free phone is usually described as “free”, but of course you pay for it in the long run. The better or more expensive the phone, the higher the monthly contract fee.

SIM-only plans are ideal if you already own a handset or have your eye on a specific phone that networks don’t usually offer.
Another major bonus is that you can choose a shorter contract period, starting at just 30 days or 1 month. You can still select 12 or 24 month deals to enjoy greater savings.

Why show 12 month deals first?

We show 12 month deals by default because they generally present the best value for money. We do revisit this every now and again to make sure it is still true.

WhatSIM fairness promise

The prices on this page are sorted by Featured Deals and Price.

Featured deals are determined based on the price divided by the amount of data included in the tariff.

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