Can I sync music from my PC to an iPhone 3GS previously synced with a Mac without loosing all other data?

Hi, I have just purchased the new iPad. I want to copy my entire iPhone cotnact list to the iPad. I have a bit of a problem, however, I cannot use the iCloud, for my iPhone does not support iOS 5 (it is a very old device). I cannot use iTunes sync either...

My old laptop died, and it was the one I used to sync music between my laptop and my iPhone 3GS(OS 4.0). I had about 30GB of music on it. Now I have a new laptop, and I want to get the music ON my iPhone transfered TO my NEW laptop. Is this possible...

As soon as I want to sync my Apps or Music, I get this type of message "Are you sure you want to sync apps (music)? All existing apps (music) and data (playlists) on the iPhone "NAME OF IPHONE" will be replaced with...." I don't want...

i tried to do this, but see this is my brothers old computor (mac-air) and it just synced everything that was on his iphone with mine, i have the 3gs how can i delete all his contacts music and all that and sync the itunes with my iphone, or can i download...

I'm finally making the switch from PC to Mac, and I have some questions to make sure it all goes smoothly with my peripherals, which are currently synced to my PC. I have an iPhone 6 and an iPad 4th gen updated to the latest iOS. I'm specifically concerned...

Hi I have an iPhone 3GS with iOS 4.2.1 version. It used to be synced with my previous PC which is now, sadly, broken. I bought a new mac and it, obviously, has a new iTunes and data (my mac doesn't have all of the apps I have on my iPhone). I would really...

Here's the problem: my iPhone is synced to another computer. Recently, the motherboard got damaged and it can't be repaired anymore. So I decided to sync it to my own Mac since I can't sync to the old com anymore. I went to iTunes on my own Mac and checked...

Ok i have an iphone 4 and my mom has a iphone 3gs i sync mine all the time and everything is good but when i put my moms in there it ******* says it is going to delete my apps they are both jail breken is there any way that i can just sync her Iphone...

My laptop crashed a few months ago. I still haven't been able to get it fixed. I want to update my 3GS to iOS 5, but I am unable to sync it to my pc while it is in safe mode. Can I update on a different PC without losing all my data (contacts, messages...