Wireless internet, or WiFi for short, lets smartphones, tablets, laptops, cameras and all other WiFi-enabled devices connect to the internet using radio waves (via a router).

When using a WiFi hotspot, your device needs to have its WiFi capability switched on (it should be somewhere under 'settings' or 'connections'), and you need to be in range of the hotspot.

Here at All Bar One we've installed free O2 Wifi at every one of our bars, making each of them an 'O2 Wifi hotspot'. Unlike many other kinds of WiFi hotspots, O2 Wifi is free - no hidden charges or nasty surprises, just free, fast and easy internet access. And it's available to everyone, whether or not you're an O2 customer. You can sign up for O2 Wifi at any of its hotspots. Once registered, your WiFi-enabled devices will be connected automatically every time you visit an O2 Wifi hotspot. You don't need any passwords or usernames to connect, and using the service won't eat into your mobile data allowance.

It's simple. Just register your details the first time you access our free service (unless you've already done so at another O2 Wifi hotspot). You'll only need to do this once and you can enter up to five devices. Once signed up, your smartphone, tablet, laptop or whatever WiFi-enabled device you've registered will connect automatically every time you drop by an All Bar One (or other O2 hotspot).

It's easy to get online using our free WiFi:

1. Check that your device's WiFi is switched on
2. Select 'O2 Wifi' from the network list
3. Open your internet browser and follow the sign-up instructions (enter your phone number and the name of the device(s) you're connecting with)
4. O2 Wifi will send you a text message containing a code. Enter this plus a few simple details
5. Your welcome page should appear - you're now connected

Just click the 'No mobile coverage' link at the bottom of the page and follow the registration process. You'll be given two hours of free usage to tide you over until you can access your SMS. But you will need to fully register (with the code you've been sent) on your next visit to an All Bar One or another venue with O2 Wifi.

The strength of O2 Wifi depends on things like how far you are from the access point (although if you're inside the venue, that shouldn't be a problem). Or how many people are trying to connect to the same hotspot at the same time. Also, some gadgets connect to WiFi quicker than others.

You'll find additional info at o2wifi.co.uk. Alternatively, call O2 Wifi's customer support line on 0844 4632626, which is open 8am-9pm from Monday to Friday, 8am-8pm on Saturdays and 8am-6pm on Sundays.

A number of reasons. One, security - it helps us protect you from nasty viruses and fraud. Two, legally we need to ask people to register some information about themselves before using the service (to comply with European Data Retention directives). This information may be made available to authorities as required, but we won't share your details with any third party companies. Three, it's simpler. Registering means you don't have to log in when you visit an All Bar One or any other O2 Wifi hotspot. You'll also get the opportunity to opt in for news and offers from All Bar One.

The terms and conditions for using our free WiFi internet service can be found on the landing page when you connect to the O2 Wifi hotspot at All Bar One.

O2 Wifi's wireless network is one of the most secure public access networks. When using it you'll see a personalised welcome page with your name displayed - so when you enter an O2 Wifi hotspot, you'll know that it's genuine. However, your device will be connected to a public network and, as such, may still be vulnerable. O2 Wifi offers the following tips and precautions to help you to protect your personal data:

• Look for URLs/addresses starting 'https' when using websites that require logging in (e.g. online email, Facebook or Twitter). The 's' in https means that the page is encrypted and your details are therefore more secure
• Only enter info like personal banking details once you know the website is secure (look for the padlock icon on your browser, click on it to confirm it is secure)
• Avoid leaving credit card details exposed on-screen
• Be careful when responding to emails - avoid divulging any personal or financial details, and remember that your bank will never ask you to send them your password or PIN
• Avoid 'phishers' (sites that resemble legitimate businesses but are in fact fakes designed to steal your personal details)
• Install and update well-known anti-virus software and personal firewalls if appropriate
• Ensure that you turn off automatic log-in facilities and that you log out when your session ends (check that 'Keep me logged in' boxes are not ticked)
• Use a secure, free VPN to connect to the internet - O2 Wifi recommends http://hotspotshield.com/
• Ensure that your device is password or pin-protected
• Don't leave your laptop unattended in a public place. Lock your screen if you absolutely need to leave it