If you keep looking at your device and seeing the network icon rapidly flipping between 5G, 4G, and sometimes 3G, you are experiencing “network thrashing.” This constant switching is frustrating, ruins data streams, and rapidly drains battery life.
The Cause of Network Thrashing
Your device is programmed to always seek the fastest available connection (5G). However, it is also programmed to drop to a lower connection (4G) if the 5G signal becomes too weak to sustain a data transfer.
This constant switching happens when you are on the fringes of 5G coverage.
1. The “Breathing” Effect of Cell Masts
Mobile mast coverage areas are not static; they “breathe.” As more users connect to a mast, its effective range slightly shrinks. If you are on the very edge of the 5G coverage zone, the signal will reach you when the mast is quiet, but drop away when the mast gets busy, throwing you back to 4G.
2. Indoor Penetration Issues
5G frequencies are notoriously bad at penetrating walls. If you are sitting near a window, your phone might catch a 5G signal. If you lean back into the room, the wall blocks the 5G, forcing the phone down to 4G.
3. Handover Failures
When you are moving (e.g., in a car or train), your device is constantly being handed over from one mast to the next. Because 5G coverage in the UK is still patchy compared to 4G, your phone will constantly gain 5G near a town, lose it on the rural road, and drop to 4G.
Why Stability Beats Speed for Hardware
For personal smartphones, this switching is annoying. For business hardware like CCTV routers, payment terminals, or telemetry sensors, this constant switching causes the device to temporarily lose its IP connection, dropping video streams or failing card transactions.
Anywhere SIM prioritizes stability. Our multi-network IoT SIMs are engineered to lock onto the strongest, most stable connection available, providing a rock-solid data stream without the disruptive thrashing between networks.