I need to update my phone, but my computer broke, and do not have a new one. I have an Itunes account, can I use someone else computer to go through with the update?  Is there a chance of loosing all my data, ie: music/photos?

I need to update my phone, but my computer broke, and do not have a new one. can I use someone else computer to go through with the update if i log on with my itunes account or Is there a chance of loosing all my data, ie: music/photos? And if all else fails can i go to the apple store and have them update my phone?

Update to what? The 3G you want to update? You have ios3 or 4 on that 3G?
Go to a friend, authorize that pc.
Read this : http://support.apple.com/kb/ht1848
and this : http://support.apple.com/kb/ht2519
Make a backup of your stuff (from the phone. apps/photos/music/blabla). Update your phone. The phone will restore the backup automatically.

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