5G home broadband vs a fixed line: when mobile wins
Mobile home broadband — a router that connects over the 4G or 5G network instead of a cable — has become a real alternative for a narrow group of households. For everyone else it is a compromise that looks cheaper on the advert than it proves to be in use.
The difference is not speed. It is what happens when the network is busy, and what the fair-use terms allow.
Mobile broadband suits one or two people in a home with strong 5G signal, moderate usage, and no need for a stable connection for work calls. It is a poor fit for households with heavy streaming, gamers, or anyone whose income depends on the connection. Test the signal at your address for a week on a rolling plan before committing to a longer term.
What is actually different
A fixed line is yours: a dedicated path to the exchange or the headend, with capacity that does not depend on your neighbours. Mobile is shared radio. Your speed depends on how many people are using the same cell at the same moment, and that includes everyone within a few hundred metres regardless of which provider they are on.
This produces a characteristic pattern: excellent speed at 11am, poor speed at 8pm, unusable during a big match. Fixed lines degrade under load too, but far less dramatically and far more predictably.
Mobile vs fixed, in practical terms— scroll sideways
| Mobile broadband | Fixed line | |
|---|---|---|
| Typical download | 50–300 Mbps (5G) | 36–1,130 Mbps |
| Upload | 10–40 Mbps | 5–1,000 Mbps |
| Latency | 20–60 ms, variable | 8–20 ms, stable |
| Peak-time behaviour | Depends on local cell load | Broadly consistent |
| Installation | None — plug in | Self-install or engineer |
| Contract flexibility | Often 30 days | Usually 18–24 months |
| Data cap | Frequently present | None |
Ranges are typical. Check the specific plan's fair-use policy before relying on it for heavy use.
The two traps
The first is the fair-use clause. Many unlimited mobile plans are unlimited in name only: sustained heavy use can be throttled, or the plan can be excluded from streaming at full resolution. Read the policy, not the headline.
The second is the address check. Coverage maps are modelled, not measured. A postcode can show excellent 5G while your specific flat sits behind a wall that blocks it. The only reliable test is a device in the actual room, at the actual time of day you will use it — which is why a 30-day rolling plan is the right way to start, even if it costs more per month.
Where it genuinely wins
- You are in a rental with a short tenancy and no permission for an installation.
- Your street has no fibre and the copper line delivers 10 Mbps — a decent 5G signal is a large upgrade.
- You are waiting for a fixed install and need something working for a month.
- You live alone, stream in HD rather than 4K, and do not work from home on video calls.
Where it fails
- Two or more people working from home on video calls. Latency variation is what breaks calls, not raw speed.
- Gaming. The variable latency is worse than a slower but stable line.
- Heavy 4K streaming across several devices at peak time, when the cell is contended.
- Anyone with a smart-home setup that depends on a stable connection, or a monitored alarm.
How to test before you commit
Take a rolling monthly plan, or use a pay-as-you-go SIM in a phone, and test in the room where the router will sit. Measure at 8pm on a weekday, not at midday. Run a latency test as well as a speed test — a low-latency 80 Mbps connection is better for calls than a high-latency 300 Mbps one.
If the evening results hold up for a week, mobile is a reasonable choice. If they swing wildly, you have your answer before you have signed anything.
Ready to see what's available?
Prices and availability depend on your postcode. We show dated prices for the main Virgin Media tiers, then send you straight to the provider to confirm.