WTF! Why did my iPhone deleted my music!

My step dad got me an iPhone 4 and at first i was downloading music from his computer but now that my computer is back on I tried it on mines. When I connected it, it sync and deleted all my music and one ringtone. And I can't drag any music back on.

How come I can't drag any music? I've been doing it the whole time.

How to facetime someone in China from US?

So I have an ipad and someone in mainland china has an iPhone and we're trying to facetime. I used his email address and iPhone number. I think I'm suppose to put 011-8621 to make the international call to china but both are not working… Can anyone help me? Has anyone facetimed to china from the us? And if it doesn't work is there an alternative? Something like Skype but like a china version?

Desktop can't find wireless connections, but other devices can?

I have been currently trying to connect to the internet using my desktop. I'm able to connect using my iphone, pc laptop, and mac, but not my desktop. My desktop is running on Windows 7 ultimate. I purchased this desktop a couple years ago as a vista, and upgraded it to a 7.It's model is HP Pavilion?

I have tried searching up several solutions, and tried entering different command prompts and unplugging the modem and plugging it in again.

When I look at the Network & Sharing Centre, it says that the Network Unidentified on a public network. The icon shows a little yellow triangle with an exclamation point in the centre.

When I view the status of the local Area Connection, (which is an Intel(R) 82566DC Gigabit Network Connection), it says the IPv4 and the IPV6 connectivity has "No Network access".

When I run a troubleshoot, the problems found is "Local Area Connection doesn't have a valid IP configuration - Not Fixed"

Can anyone help out with this please? It's been like this for about 24 hours now.

Is downgrading the ios possible?

I'm currently running ios 4.2.1 on iphone 4.
I'm thinking of upgrading to ios 5.1.1 or even ios6

However, is it possible to go back to 4.2.1 if I encounter any problems with it?

Can i use a used iphone 4s to unlock on tmobile?

I was wondering if i could get a used at&t iphone 4s from a site like craigslist. I have tmobile and i was wondering if i could still use the at&t phone with tmobile instead of buying the $549 from apple. Can someone please help me?

I dropped my iphone and it won't turn back on on its own

I dropped my phone and it will only turn on when i plug it into a main charger. When it turns on it says i need to activate it again with itunes, however when i unplug it in order to connect it to my laptop it turns off and won't turn back on until its plugged into the main charger again.

Worth upgrading from iPhone 4 to Samsung Galaxy S3 (and concerns)?

I have seen online that I'm able to sync music and video from iTunes to the S3, but my real concern is the money I've spent on iTunes apps. I have an iPad so the apps would not necessarily go to waste, but would it be worth getting the Galaxy S3? I really love the idea of customization that you just can't get with iOS and the performance.