The end of 2G and 3G mobile networks is approaching—and for anyone relying on older devices or roaming SIMs for IoT, connectivity, or remote site access, now is the time to act.
At 4grouter.co.uk, we supply the routers, antennas, and industrial-grade SIMs that power critical infrastructure, security, transport, and smart devices across the UK and beyond. This upcoming change could affect your current deployments if not addressed early.
What’s Changing?
O2, the last UK network supporting 3G roaming, will switch off 2G and 3G inbound roaming access from October 2025. This means any roaming SIM using O2 as a fallback network will no longer connect using these legacy technologies.
If your router relies on multi-network or international SIM cards and drops to 2G or 3G when 4G coverage isn’t available, this functionality will no longer be supported on the O2 UK network.
And since the other UK networks have already sunset 3G, this effectively ends all 3G roaming in the UK from that point forward.
Could This Affect My Router Setup?
It might—especially if:
- Your router uses 2G or 3G as backup
- You’ve deployed devices in rural or fringe coverage areas
- You use international roaming SIMs that fallback to O2
- Your devices don’t support 4G LTE or VoLTE for voice
Common use cases affected include:
- Construction site routers with roaming SIMs
- Remote CCTV systems with fallback-only signal
- Industrial equipment still using legacy modems
- POS terminals or kiosks deployed with low-data, low-cost SIMs
Recommended Actions
To ensure uninterrupted service, 4grouter.co.uk recommends the following:
✅ Upgrade to 4G/5G-Ready Routers
We supply a full range of Teltonika, Proroute, and Neowave 4G/5G routers—ready for seamless connectivity on modern networks.
✅ Check Your SIM Profile
Our multi-network, fixed IP, and Dual-IMSI SIMs are built for resilience. If your current SIM setup isn’t compatible with the upcoming sunset, we’ll help you migrate without disruption.
✅ Enable VoLTE Where Needed
For routers or M2M devices using voice features (like alarms), ensure Voice over LTE (VoLTE) is supported and enabled.
What Millbeck Can Do for You
At the 4G Router Store, we don’t just sell boxes—we deliver end-to-end mobile connectivity. That includes:
- Future-proof routers compatible with 4G, 5G, and LPWAN
- Industrial-grade SIMs – roaming IoT SIM Cards that automatically switch between UK networks
- Private APNs and VPN-ready SIMs for secure remote access
- Friendly, expert advice to ensure you’re protected against downtime
Whether you’re deploying new sites or upgrading legacy systems, our team is here to guide you through the changes and ensure your solution is robust and reliable long into the future.
Need Help?
Don’t wait until October 2025 and the 2G Sunset to discover your device has gone offline. Contact our team at Millbeck today and let’s review your router and SIM setup together.
Call us or email to discuss your upgrade path—we’ll help you stay connected.