[note color=”#FFCC00″]Info: This guide is outdated! Click here for the updated 2012/2013 edition of the article.[/note]
The team of Changi Airport offers international travellers free WiFi  in all terminals. Just connect to the WiFi and you’re online? It’s not that simple. You can find here the original information page. Here’s a short and simple step by step guide:

step 1 – check requirements:

• You need your passport
• Your Netbook/Notebook/Tablet/Pad/Smartphone oder other WiFi enabled device

• step 2:
  Go to any information desk in the transit area, you can find them every few hundred meters in all terminals.
• step 3:
  Ask for the “Free WiFi Pass”. The staff of the information desk will eventually ask you for your passport to note the details.You get a piece of paper with login details.
• 4th step:
  Connect your WiFi device with the access point “Wireless@SG” (SSID). As soon as you want to visit the first website, you will be redirected to a login form.
• 5th step:
  Enter your the login details from the paper and submit. Now you’re online!
  Select as service provider “M1net”. The username contains @m1net.com.sg. The password is uppercase.

I’ve used this WiFi in Terminal 3 at Singapore Changi Airport a couple of times. It should work the same way in the other terminals.

[note color=”#FFCC00″]Info: The access for each Username/Password combination is limited to a few hours.[/note]