Sim only and pay as you go deals review and offers
WhatSIM helps you make the best decision about which SIM Only deal is right for you. Use our guides, pricing tables and comparison tools to make the best choice for your budget.
SIMO and PAYG by Network
Looking for a specific mobile network? Jump straight to reviews, deals and recommendations for all the networks we feature. We feature 21 networks - more than any other SIM comparison site.
We are committed to helping you get the most out of your new and existing mobile contract, as well as equpping you to make the best choice for your next one. Check out our guides here.
The Definitive Guide to SIM Only
Choosing the right SIM only deal for you
We make it easy to find the best SIM Only deal for you, whether you want to save money, get unlimited 4G data for your tablet or just get a cheap deal while you wait for your next phone to be launched.
If you already have a mobile phone then you can easily save over £30 a month by moving to a SIM Only contract with minimum terms as short as 30 days. More and more people are discovering how much money they can save by going SIM Only, so let’s get started!
This is a Fair Website
This site was built by experienced professionals who have worked in the mobile industry for years. We have years of experience working with mobile phone networks, resellers and comparison sites and understand that most comparison websites don't always offer the best choice. We are committed to doing things differently.
Featured and top deals on WhatSIM are calculated based on merit and maths. Networks cannot boost their deals by paying us more money. Read more about the WhatSIM fairness promise here.