The UK’s mobile networks are phasing out 3G to make room for faster, more reliable 4G and 5G services.

While most mobile phones already support 4G or 5G, many businesses still rely on equipment that doesn’t – and that could cause problems once 3G is fully switched off.

What could be affected?

Devices such as vending machines, vehicle tracking and telematics systems (like TomTom units), IoT sensors, M2M (machine-to-machine) equipment, payment terminals, and remote monitoring systems may stop working if they can’t connect to at least 4G.

When is it happening?

By the end of 2025, 3G will be gone from most areas – so now is the time to check what you’re using.

What to do next

It’s not just about getting a new SIM – you’ll need to make sure your devices themselves are 4G or 5G enabled and compatible. Both the device and the SIM need to be checked and updated as required to ensure continuity of service.

Remember, 4G is now the minimum requirement to connect to mobile internet once 3G is switched off. However, most new SIMs and devices are 5G-ready, offering faster speeds and improved reliability where coverage is available.

You don’t necessarily need a new contract – if your devices are 4G or 5G ready, switching to a 5G-enabled SIM is usually enough.

Watch out for SIM swap fraud

There’s a growing scam called SIM swap, in which criminals persuade a mobile operator to deactivate your SIM and activate a new one they control. Once calls and texts are diverted, fraudsters can quickly try to reset passwords and access accounts – often with devastating consequences.

How it typically works:

• The attacker convinces the mobile operator they are you (often claiming the phone was stolen).
• The operator cancels the original SIM and activates a new SIM held by the criminal.
• The fraudster receives your SMS messages and calls, then uses them to break into accounts.

How to reduce the risk:

• Ask your mobile provider to add a secure account PIN or password that must be given before accessing your account.

• Avoid SMS-based two-factor authentication where possible – use authenticator apps or hardware keys instead.
• Keep account recovery details and personal data private (don’t share DOB, address, or mother’s maiden name publicly).
• Monitor mobiles and services for unexpected loss of signal – if your phone suddenly stops working, contact your operator and bank immediately.
• Set up bank/fraud alerts and know how to quickly freeze or flag accounts if you suspect fraud.

How TST can help

• Review which devices and services will be affected by the 3G switch-off
• Check device compatibility (device + SIM) and recommend upgrades where needed
• Provide suitable 4G/5G SIMs and manage the SIM migration
• Advise on SIM swap protections and supplier account security, and help liaise with operators if issues arise

If you’re unsure whether your equipment is 3G only or 4G/5G ready – or want to reduce the risk of SIM swap fraud while you migrate – speak to TST today. We’ll review your setup and make the transition as simple and secure as possible.