http://www.three.co.uk/homesignal

Home Signal can help enhance your indoor signal. You may be eligible to get a Home Signal box if you have trouble connecting to the network indoors, you live in a rural area or if your house has thick walls that block your signal.

You need a 3G Three phone to use the Home Signal box and up to four phones can use it to send or receive calls, texts or data at any one time. You can also register up to 32 different numbers with it, so your friends and family can use their phones in your home, as long as they're on Three. You can set up your Home Signal box so that only the people you've given access to will be able to use it.

To set up your family and friends on your Home Signal box, just fill in our online form.

The box can send out a signal for up to 15 metres and on average, it's likely to use around half a gigabyte of your Home Broadband allowance per month, depending on your usage. An hour talking on the phone uses around 37MB of data.

To use the Home Signal box, you need:

a 3G Three phone and SIM
the Home Signal box, green Smart Card, Ethernet cable and power cable
a fixed line Home Broadband connection and router with a spare Ethernet port
a minimum speed of one megabits per second (check your speed at www.speedtest.net)
a spare mains plug socket.
Setting up your Home Signal box.

You can find out how to set up and use your Home Signal box here.

Returns.

If you leave us, or you’re still having indoor coverage problems with the Home Signal box, call 0800 358 4828 so we can discuss your signal issues further.
If you’re upgrading, the normal 14 day money back guarantee applies.

Note:

You can only use a Home Signal box in your UK home, for non-business purposes. If you move, you must let us know your new address before using the Home Signal box in your new home.
We can’t guarantee that coverage will reach outdoors.
The Home Signal box will use some of your Home Broadband data allowance. You should check your data limits and keep track of your usage so you don’t go over your allowance.
Only eligible people will be sent a Home Signal box. To find out whether you might be eligible, call us on 333 and select option 3.
I think Ben's eligible for this