What is this calDAV password?

I'm trying to set up my iPad and iPhone with yahoo. It keeps asking for a calDAV password. What is this? Where do i get the password from? What do i do to get it working?
Strangely, this does not seem to happen when my friend puts in his yahoo id?

Will my iPhone work in US while here from Okinawa, Japan?

I'm in the US for several weeks. My iPhone is not working. I have it subscribed to service in Okinawa Japan.

Should my iPhone be working properly to make calls and send MMS, and check email?

Is there something I need to do to make it work? Thank you.

Added (1). Thank you Tech One. But do I have to change carriers while I'm here? I'm still active with my current carrier from Japan.

Getting a replacement iPhone?

My iPhone 4 has water damage, it's not severe, but I want to get a replacement. I know it's $100. If I take my phone to the Apple Store, will they give me the replacement right then if I pay, or will I have to wait for it to be shipped to me? Also, will they be able to transfer my contacts? Will I have to do anything with my phone carrier(Verizon) to get it to transfer?

Watch Apple iPhone 5 launch live?

Just wondered if there's any way of seeing the Apple iPhone 5 keynote live on Wednesday (i.e streaming)?

Added (1). Brilliant thank you all! Hate to sound daft here but will I be able to view the event live or just after the announcements?

Can't manually sync iPhone with iTunes?

I have an iPhone 3G, and I'm trying to manually sync it to my iTunes. It worked on one of my computers, but I'm unable to manually drag music or movie files when it's connected to another computer. Does it only work with one computer? My brother uses an iPod Classic and he is able to manually sync music from any computer. Is the iPhone incapable of this feature?

How to hide the fact that I broke my IPhone 4S s screen?

My Iphone slipped out of my pocket in class today and it fell flat on the floor and the screen shattered.
The touchscreen still works just the glass thats broken. I told my mum and she said that she's not pay for fixing it. So from now until i get enough money to fix it ( about a month) how can I hide the fact that its broken from my dad?

Added (1). I can't tell him about because this is the fourth phone he got me this year: c So telling him is NOT an option