The Basics Web bolt on gives you access to 100MB of 3G or 4G data for £3 per month. This bolt on is ideal if you only need a little bit of data or if you will only be in the UK for around one week..
The All Rounder Web bolt on gives you access to 500MB of 3G or 4G data plus unlimited Wi-Fi access at thousands of BT Openzone and the Cloud Wi-Fi hotspots in the UK on your phone plus 20 MMS picture messages for £6 per month. This includes both 3G or 4G data and Wi-Fi access at 7500 BT Openzone and the Cloud Wi-Fi hotspots. This is the most popular Web bolt on and is ideal if you're travelling with a smartphone like the Apple iPhone.
The Works Web bolt on gives you access to 1GB of 3G or 4G data plus unlimited Wi-Fi access at thousands of BT Openzone and the Cloud Wi-Fi hotspots on your phone plus 50 MMS picture messages for £10 per month. This includes both 3G data and Wi-Fi access at 7500 BT Openzone and the Cloud Wi-Fi hotspots. This bolt on is ideal if you're travelling with a smartphone like the Apple iPhone and need more data.
To set up O2 Web bolt ons call 2425 free of charge from your O2 Pay & Go mobile phone.
Data is only included with O2's Web bolt-ons in England, Northern Ireland, Scotland and Wales. No data is included when roaming outside the UK.
You are charged £1 per day for data if you don't have a web bolt-on or if you have used all your web bolt-on allowance.