If your device is locked to a specific network, then you also need the SIM card to be for that network – or to unlock your device. To help us keep this site secure, please let us know that you are not a robot by entering the text from the image below. The USA has already switched off all 3G networks, and other countries all over the world will be following suit, with varying timetables.

Sim card sizes explained: Nano SIM, Micro SIM, or Standard SIM? Sim card sizes explained: Nano SIM, Micro SIM, or Standard SIM?

Your mobile provider should contact you with plenty of advance warning before you lose access to 3G data, but proactively contacting them should be your first step if you have any concerns about 3G services being discontinued. Note that standard SIM cards are also sometimes known as regular SIMs or mini SIMs – the latter because there was an even bigger credit card-sized SIM card available when these launched, but they’re no longer used. It was introduced back in 1996, and as the oldest of them it was the standard for a while – hence the name. If you have any of these devices, it may need to be upgraded to make sure it still works when the 3G networks are switched off. A SIM card adapter is a piece of plastic that you can place a micro or nano SIM card into to convert it into a larger size.A standard SIM is the biggest SIM card size currently in use, and despite being thought of as the ‘standard’ it’s the most rarely used. You’ll be able to get the double data offer for a maximum of 3 consecutive months, before your Rocket Pack goes back to the regular data. The exception is if you want to use an eSIM, in which case you will usually need to request one – though many networks don’t support them.

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Nano SIM cards are the most common size – most smartphones made from around 2015 onwards use a nano SIM card. It’s the day when one Rocket Pack runs out and the next one is added, so you have to use the data, minutes and texts included in your Rocket Pack by this date, or you’ll lost them. However, some older phones, including simple phones, will no longer be able to connect to a network to use data.Only the emergency services and government departments, agencies and public bodies that deal with emergencies will be able to send alerts. Update 11 September 2023: O2 has announced it will begin phasing out its 3G services in 2025, which it aims to complete by the end of the year.

pay as you go Sim deals: Compare the best offers - MSE Best pay as you go Sim deals: Compare the best offers - MSE

Use the O2 network status checker to see if there’s a known network connection problem in your area, or to report an unknown issue to us. We don't as a general policy investigate the solvency of companies mentioned (how likely they are to go bust), but there is a risk any company can struggle and it's rarely made public until it's too late (see the Section 75 guide for protection tips).The emergency services and the UK government do not need your phone number to send you an alert – you will get an alert if you are currently near an emergency location, but no data will be collected or shared about your device or location. Over eight million households on certain benefits and tax credits will receive their second cost of living payment from today (Tuesday 31 October). All smartphones (and feature phones and other types of mobile phones) require a SIM card to connect to a mobile network – as, in fact, do mobile broadband devices, and any tablets that offer mobile connectivity. As such, any phones that cannot connect to 4G and 5G networks will not receive these emergency alerts.