Guide to failover
Internet failover with 4G/5G — how backup connectivity works
A failover router switches automatically to mobile 4G/5G when your fibre goes down — so the shop, office or home stays online. Here is how it works and who needs it.
What is internet failover?
Failover is an automatic backup connection. A failover router monitors your primary line — usually fibre — and the moment it stops reaching the internet, it switches all traffic to a second connection, typically mobile 4G/5G broadband. Your devices barely notice; they keep the same network and carry on working. When the fibre is back, the router switches back automatically.
With and without failover
Who needs failover?
Anyone whose operation stops when the internet disappears. Some typical examples:
What to look for when choosing
The most important thing is that the switchover is automatic and fast — that the router tests the real internet connection, not just whether the cable is plugged in. Also look for 5G with 4G fallback for both speed and reach, an included SIM and mobile broadband so you don’t have to source it separately, and the option of an external antenna where mobile coverage is weaker. A good solution also switches back to fibre automatically once it is restored.
Ready-made 4G/5G failover from Internetport
Our failover router comes ready with a SIM and mobile broadband — plug it in and 5G takes over automatically if the fibre goes down. Available for both home and business, with Swedish support.
Common questions about failover
What is internet failover?
Failover is an automatic backup connection. A failover router monitors your primary line (usually fibre) and, the moment it goes down, switches your traffic over to a second connection — typically mobile 4G/5G broadband — so you stay online. When the primary line returns, it switches back automatically. The goal is zero, or near-zero, downtime.
How does a 4G/5G failover router work?
The router has two internet sources: your primary wired connection and a mobile connection via a SIM card. It continuously checks that the primary line actually reaches the internet, not just that the cable is plugged in. If it fails, the router routes all traffic over 4G/5G within seconds, and your devices keep the same network without any manual change.
How fast does it switch over?
A good failover router detects an outage and switches to mobile within a few seconds. Brief sessions like a phone call may blip, but web browsing, card terminals and most apps simply continue. Switching back to the primary line when it recovers is just as automatic.
Do I need a separate SIM card and subscription?
Yes — the mobile backup needs a SIM with a data subscription. With Internetport’s failover solution the SIM and mobile broadband are included, so you get a ready-to-use backup line rather than sourcing a SIM separately. Because the mobile line is mostly idle until needed, data use is usually low.
Is failover only for businesses?
It is most common in businesses that cannot afford downtime, but home offices, remote workers and anyone who depends on a stable connection benefit too. If a couple of hours offline would cost you money or major inconvenience, failover is worth it — for a home it is an affordable insurance against fibre outages.
Should I choose 4G or 5G for the backup?
Both work well as a backup. 5G gives higher speeds where there is coverage, while 4G has broader reach and is more than enough to keep a business running during an outage. A router that supports 5G with 4G fallback gives the best of both — an external antenna can also improve the mobile signal where coverage is weaker.