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(Pocket-lint) - Ordered a new phone? Such as the Samsung Galaxy S22, Apple iPhone 13, Huawei, Redmi, Oppo or other.

Or are you just in the market for a great SIM Only deal? It's an ideal time to switch as there are some good plans around, and we've rounded up the best below.

Over the past few years, SIM contracts have seen something of a resurgence. These SIM Only deals allow you to move networks easily and give you great value for money; they're available either on a 12-month, or even rolling monthly plans. 

These SIM-only arrangements are also perfect if your contract is up and you want to save money by not upgrading to a new phone, or you'd rather buy a mobile phone SIM free.

Below, we'll bring you the best SIM only deals selected from EE, Three, Vodafone, O2, Giffgaff and more, all saving you the time and effort of hunting around for these very offers.

The best deal for heavy data users

We've selected a few good deals here for those that like to use their phone a lot, away from Wi-Fi. Whether this is streaming video, playing PUBG mobile or heavy social media use - these are great for you. They're all unlimited data plans, so there's no need to keep an eye on your data usage throughout the month.

Three unlimited data for just £16 a month
Smarty unlimited for £20
Virgin Media unlimited data priced at £25

The best offer for medium data users

We've picked some leading middle of the road SIM offers that aren't geared up for those the really heavy data users, but they should still meet the needs of many.

Smarty 60GB for £10 a month
Virgin Media 30GB for £13
Vodafone 30GB priced at £10

The best deal for low data users

These plans are great for those that don't use much data when they're out and about, perhaps they're mostly on Wi-Fi or just really don't have data intensive apps on their phones. 

Vodafone 4GB coming in at £6
iD Mobile 8GB costing £7
Plusnet 4GB for £6

Why choose a SIM Only plan

Choosing a SIM Only plan is a good way of saving some money, by either keeping your current phone when it's out of contract and switching or buying a new phone outright and then getting a SIM contract.

The latter could be more cheaper in the long run, when you work out the total cost of both the phone and the SIM Only plan added together. 

That could very well undercut the cost of getting a phone on a long contract, and it also gives you the added benefit of being able to switch networks when a better deal becomes available.

That's because SIM Only plans can be taken out in either 30 day, 12 on 24 month contracts, where typically a phone contract is over two years.

How much data should I use?

When opting for a new plan it's worth taking a look at your current allowances, and how much you go over on a regular basis. 

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If you're frequently hitting the limit on a 10GB plan and are either buying more data, or only using Wi-Fi - get a bigger plan now.

You might also be switching to a 5G phone which has the potential to use more data with its faster Internet speeds, so it's worth considering that when switching.

Which size SIM card should I get?

Most phones have a nano-SIM card slot, compared to some years ago when there was a mixture of nano and micro SIMs.

But do not worry on that front, as most SIM cards arrive in one size to fit all and you pop out the SIM to match your phone.

Compare the cheapest SIM only deals

Couldn't find a SIM deal above? Here you can compare all the best SIM only deals available right now. You can use the sliders and menus to choose the best deal that suits your needs.

Writing by Rob Kerr.