What's the default password for Wi Fi?

[#1]

Topic.
Usually the Wi Fi password is on the bottom of the router, I had a look last week, couldn't find it.
Anyone know the default password for Wi Fi? I'm asking so that I can download songs from Amazon on my phone using Wi Fi rather than my data allowance.

[#2]

It's different on every router shipped.
Go to the routers admin page and select Wireless under Home Network. Then click details at the top right. It should be shown at the bottom of that page.