Got questions about your new SIM Only deal?

SIM Only Help & Guides

Our SIM Only Guides explain basics of SIM Only deals, including how to keep your number when switching networks, what SIM card you need for your phone, and how SIM Only contracts work.

Ready to choose a SIM Only deal? You can also compare SIM Only deals from UK networks and retailers.

Browse SIM Only Guides

Consumer Rights

Which Mobile Networks Offer Spending Caps?

Which Mobile Networks Offer Spending Caps?

Last updated: 17th May 2026

Your mobile phone bill can often be stressful, especially if you are...

What Is Ofcom? What Does It Do?

What Is Ofcom? What Does It Do?

Last updated: 22nd March 2026

It seems that not a week goes by without Ofcom being mentioned in the...

Coverage & Roaming

O2 Roaming Explained: EU and Worldwide Charges 2026

O2 Roaming Explained: EU and Worldwide Charges 2026

Posted: 4th June 2026

O2 is the only major UK network that has not reintroduced EU roaming...

Spusu Roaming Explained: EU and Worldwide Charges 2026

Spusu Roaming Explained: EU and Worldwide Charges 2026

Posted: 4th June 2026

Spusu includes EU roaming on every plan, but with a twist that catches...

Honest Mobile Roaming Explained: EU and Worldwide Charges 2026

Honest Mobile Roaming Explained: EU and Worldwide Charges 2026

Posted: 4th June 2026

Honest Mobile handles roaming differently from almost every other UK...

Three Roaming Explained: EU and Worldwide Charges 2026

Three Roaming Explained: EU and Worldwide Charges 2026

Posted: 4th June 2026

Whether you pay anything to use your phone abroad on Three depends on...

giffgaff Roaming Explained: EU and Worldwide Charges 2026

giffgaff Roaming Explained: EU and Worldwide Charges 2026

Posted: 2nd June 2026

giffgaff includes EU roaming on its plans, but its allowance works...

SMARTY Roaming Explained: EU and Worldwide Charges 2026

SMARTY Roaming Explained: EU and Worldwide Charges 2026

Posted: 2nd June 2026

SMARTY includes EU roaming on every plan with a 12GB monthly cap, and...

Honest Mobile Smart SIM Review: I Tested It Across Three Countries

Honest Mobile Smart SIM Review: I Tested It Across Three Countries

Last updated: 3rd June 2026

I had been using Honest Mobile's Smart SIM in the UK for eight months...

Your Ultimate Guide to Network Coverage

Your Ultimate Guide to Network Coverage

Last updated: 17th May 2026

Reliable mobile phone coverage is no longer a luxury but an absolute...

Your Guide to Navigating EU Roaming Fees After Brexit

Your Guide to Navigating EU Roaming Fees After Brexit

Last updated: 4th June 2026

Data roaming comes into play when you travel outside the UK, and your...

Family & Kids

The Best SIM-Only Deals for Families

The Best SIM-Only Deals for Families

Last updated: 17th May 2026

Are you looking for a simple way to save money on your family's mobile...

Best SIM Only Deals for Kids

Best SIM Only Deals for Kids

Last updated: 17th May 2026

Choosing the right SIM-only deal for a child or teenager requires...

Features & Tech

Which Networks Offer eSIMs on Pay As You Go?

Which Networks Offer eSIMs on Pay As You Go?

Last updated: 12th April 2026

Pay As You Go eSIMs let you use a digital SIM without a contract or...

What is Wi-Fi Calling - Which UK Networks Support It?

What is Wi-Fi Calling - Which UK Networks Support It?

Last updated: 4th April 2026

Wi-Fi calling lets you make and receive standard phone calls over a...

What Is An eSIM? Which UK Networks Support Them?

What Is An eSIM? Which UK Networks Support Them?

Last updated: 12th April 2026

Modern smartphones are increasingly being launched equipped with eSIM...

Networks & MVNOs

Which Networks Use Three? Honest Mobile, iD Mobile and Smarty Compared

Which Networks Use Three? Honest Mobile, iD Mobile and Smarty Compared

Last updated: 2nd June 2026

Three MVNOs use Three's network in the UK: Honest Mobile, iD Mobile...

Which Networks Use Vodafone? Asda Mobile, Lebara, Talkmobile and Voxi Compared

Which Networks Use Vodafone? Asda Mobile, Lebara, Talkmobile and Voxi Compared

Last updated: 2nd June 2026

Four MVNOs use Vodafone's network in the UK: Asda Mobile, Lebara...

Which Networks Use EE? 1pMobile, Lycamobile, Spusu and More Compared

Which Networks Use EE? 1pMobile, Lycamobile, Spusu and More Compared

Last updated: 2nd June 2026

Seven MVNOs use EE's network in the UK: 1pMobile, EcoTalk, Grade...

Which Networks Use O2? Chattr, Giffgaff, Sky Mobile and Tesco Mobile Compared

Which Networks Use O2? Chattr, Giffgaff, Sky Mobile and Tesco Mobile Compared

Posted: 19th May 2026

Four MVNOs use O2's network in the UK: Chattr, Giffgaff, Sky Mobile...

Best Network for International Calling from the UK

Best Network for International Calling from the UK

Last updated: 17th May 2026

If you regularly call family or friends in another country from your UK...

Lycamobile Review 2026: How Does It Compare?

Lycamobile Review 2026: How Does It Compare?

Last updated: 17th May 2026

Lycamobile Review 2026: How Does It Compare? Reviewed by: Phil Brown...

Spusu Review 2026: How Does It Compare?

Spusu Review 2026: How Does It Compare?

Last updated: 4th June 2026

Spusu has quietly become one of the most talked about budget MVNOs in...

What Is an MVNO (Mobile Virtual Network Operator)?

What Is an MVNO (Mobile Virtual Network Operator)?

Last updated: 23rd May 2026

A mobile virtual network operator, commonly abbreviated to MVNO, is a...

Plans & Pricing

SIM Only Mid-Contract Price Rises: What You Need to Know (2026)

SIM Only Mid-Contract Price Rises: What You Need to Know (2026)

Last updated: 6th April 2026

Staying connected with a SIM-only plan is one of the most popular ways...

Which Networks Offer SIM-Only Data Rollover?

Which Networks Offer SIM-Only Data Rollover?

Last updated: 4th June 2026

Are you looking for a SIM-only deal? There are plenty of factors to...

What is a One Month Rolling SIM Contract?

What is a One Month Rolling SIM Contract?

Last updated: 17th May 2026

A one month rolling SIM contract is a SIM-only plan that renews...

Is Unlimited Data Really Unlimited?

Is Unlimited Data Really Unlimited?

Last updated: 17th May 2026

Most unlimited data plans in the UK are genuinely unlimited in the...

SIM-Only Basics

Why SIM-Only Deals are the Smartest Choice for Cutting Your Mobile Phone Costs

Why SIM-Only Deals are the Smartest Choice for Cutting Your Mobile Phone Costs

Last updated: 17th May 2026

If your phone contract has ended and you are still paying the same...

What is a SIM-Only Deal?

What is a SIM-Only Deal?

Last updated: 22nd March 2026

A SIM-only deal is a mobile phone plan that gives you a monthly...

Switching & Setup

How to Check if Your Phone is Unlocked

How to Check if Your Phone is Unlocked

Last updated: 22nd March 2026

An unlocked phone can be used with any UK mobile network. A locked...

What SIM card do I need for my phone?

What SIM card do I need for my phone?

Last updated: 22nd March 2026

The SIM card you need depends on your phone model and whether it...

How do I keep my number when switching to SIM only?

How do I keep my number when switching to SIM only?

Last updated: 22nd March 2026

The SIM Only market is constantly changing and deals are being...