Everyone wants to get the best speed possible from their broadband. That means using the right equipment.

A filter will help you get the best internet speeds possible. It also avoids interference on your phone calls.

If you’ve got broadband that comes through your phone line you may need a filter. Read on to find out more about them and how to use one.

Diagram of a typical filter: a small rectangular box plugged into a phone socket with two ports marked “Router” and “Phone”

What is a filter (sometimes called a microfilter or splitter)?

A filter allows both your broadband and phone to work on the same telephone line.

Without one you’re more likely to get slower broadband speeds. You’ll probably also experience noise interference when using the phone.

You’ll need a filter for every phone socket in your home with telephone or broadband equipment plugged in. This includes routers, phones, answering machines, digital TV boxes and even alarm systems.

A filter has two ports:

  • A port for connecting your router or modem
  • A port for connecting your telephone equipment

Using a filter on your internet and phone line

You’ll need a filter if you have a single or standard phone socket. You should use the filters that came with your router.

If you have a double or pre-filtered socket, your phone line is already split between phone and broadband, so won’t need a filter.

You can work out what sort of socket you have with our guide to phone sockets.

If you need a filter, connecting it is easy:

  1. Unplug any devices or phones that are already in the phone socket
  2. Plug your filter into your master phone socket
  3. Plug your phone cable into the phone port on the filter
  4. Plug the cable from your router into the modem port on your filter

If you have telephones or devices plugged into other sockets, you’ll need another filter. Make sure you plug the phone or device into the relevant port.

Find out more about how to set up your router and what equipment we'll send you to get started with our broadband.

Or explore our phone and broadband packages to find the best one for your lifestyle.

You can find out more about getting the best from your broadband with our guide to extension cables.

We’ve also got advice on how to get online if your device isn't Wi-Fi enabled.

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