Although I already have mobile number registered with Wireless@SG long time ago and I have been using it occasionally, I cannot login Wireless@SG in Changi airport.
Then I clicked the Forget Password link. An instruction pops out, asking me to approach information counter? Feeling quite strange, I walked to information counter and tell them I want access to Wireless@SG. The staff immediately gave me a paper with 4 hour validity random username and password.
Clever. Problem solved.