# SIMs for 4G backup and router failover

> When a shop or office loses its broadband, the card machines, phones and cloud systems go with it. A ThingSIM in a router with a mobile backup keeps the site online until the line comes back.

## What the kit needs

### Takes over by itself

The router switches to mobile data when the fixed line fails and back again when it returns. Nobody on site has to do anything.

### A different path, not a second line

Mobile backup doesn’t share the cable, the cabinet or the exchange with the broadband, so it keeps working through the faults that take a line down.

### Sized for the outage, not the month

The SIM barely uses data until it’s needed. Choose a plan for how long an outage might last, and move it up a size if the site leans on it.

## How it connects

Office router → mobile data → ThingSIM core (Private APN) → Internet or VPN → Your cloud and office (Card payments, VoIP, apps).

## Recommended setup

**5 GB, UK 4-network, one SIM per site router.** Add a static public IP if you manage the router remotely or run a VPN back to head office.

- 5 GB, UK 4-network: £8.85 a month per active SIM, ex VAT
- Optional: Static public IP, £8 a month per SIM
- Optional: IPSec VPN, priced with us

Source: https://thingsim.com/sectors/router-failover