Using two iPhones with iTunes - erase and sync message

Me and my fiancée both have an iPhone 4. I connect to iTunes regularly and it does so automatically when I tether my phone to the lap top for Internet. We each have seperate Apple accounts. When I connected hers yesterday to add some music I got an 'erase and sync' message saying that her phone was linked to another iTunes library. We only have one lap top and so have only ever had the phones connected to that one iTunes on it. If I erase and sync will that delete all her apps, pictures etc And replace with the ones I have on my phone that have backed up to iTunes. We want to have different apps and photos.
With our iPods we set them to manual and there's no problem, but with the iPhone there is.
I don't think it matters but I'm on ios5 and she is on ios4, both are iPhone 4.

No, I hadn't thought of that. I would have had my phone plugged in before and when I plugged her phone in I wasn't prompted for a password. So no, she wouldn't have been signed in.
So, if I sign out of my account and sign in to hers, I shouldn't get this problem of being prompted to erase and sync?

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Can I use my iPhone with my Mac and PC's iTunes?

Can I use my iPhone with my Mac and PC's iTunes interchangeably?
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With the iPhone, you can sync all iTunes content with only one computer. Trying to sync iTunes content with a second computer will result in iTunes erasing the content from the first computer. However, non-itunes content such as contacts, calendars, mail settings, notes, etc. (anything in the Info pane) can be synced from another computer.

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will itunes erase and sync delete all my pictures on my phone

Sorry mixed my numbers up I was in such a hurry to post the question uploading 8052 but I have 8117

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I want to sync a new library from my iTunes into my iPhone 4 but I accidently clicked not to erase and sync, so now I want to know how to get the message of erase and sync to come back up.
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Basically i just got a new iphone 6, and was able to back up my 5s and restore it on the 6, but 2 things didnt come along in the restore, videos, and ring tones. That is when i tried to to sync the videos and ring tones thru itunes, i came across this problem.
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See Recover your iTunes library from your iPod or iOS device.
tt2

Unable to manually manage music and videos on iPhone 4 without erase and sync, same computer!

Ok, so I know you all have heard this before but I do believe my case is rather unique, and quite frustrating.
I purchased an iPhone 4 and synced it to the same computer I am using now - created the playlist and used it to sync with phone. Worked great for awhile; but one day I contracted some nasty malware and had to wipe my computer and reinstall my OS (Windows 7). Albeit my music library was on my external HDD which survived the onslaught. I obviously had to reinstall iTunes afterwards. The playlist was gone on reinstall.
Afterwards I still didn't see an issue with my iPhone and iTunes: When I plug it in it syncs, everything seems to be working accordingly.
But I recently transferred some new music from a CD to my iTunes and wanted to throw those songs on my iPhone, the drag and drop method I was so very used to did not work and I noticed that "manually manage music and videos" was uncheck under my devices summary.
When I attempt to check this option in iTunes it gives me a popup notification telling me I need to erase and sync in order to use this option because my 'iPhone is synced with another library". Again, I DID have to reinstall iTunes after reinstalling my OS.
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Here's a too long didn't read:
>iPhone 4 was working fine - used playlist to sync with.
>Had to reinstall OS (Windows 7) Playlist gone.
>Reinstall iTunes.
>iPhone still syncs with library, no error messages on connect.
>Unable to manually manage music and videos without erase and sync.
>None of the usual methods work.

Hmm, I will say after posting this and looking at the related threads it seems I can only either use manually manage or sync.
I was using sync before but since the playlist disappeared I was syncing with I simply want to add music to my phone without deleting everything. Is this possible?
If I use "manually manage music and videos" will it delete everything or just the music and videos? It doesn't specify...
Could I just create a new playlist and sync it with that? If so how?
The bottom line is it isn't that big of a deal if I need to simply rebuild my iPhone music library but losing my configuration, contacts etc is not an option. Optimally I would just like to be able to add my new music to my iPhone without having to rebuild my library.

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do not confuse moving your whole folder and library with moving just media files as in
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Macworld - How to transfer iTunes libraries between PC and Mac - http://www.macworld.com/article/46248/2005/08/shiftitunes.html
Move an iTunes library from a Windows PC to a Mac - http://www.macworld.com/article/1146958/move_itunes_windows_mac.html
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Post by Zevoneer: iPod media recovery options - https://discussions.apple.com/message/11624224 - this is an older post and many of the links are also for old posts, so bear this in mind when reading them.
Commercial software utility for transferring songs from i-device to Mac - http://www.fadingred.com/senuti/
http://support.apple.com/kb/HT1848 - just media purchased from iTunes Store

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Really appreciate this quick response. So I guess there won't be an issue to use the same id on two iPhones at the same time.
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xtremecarbon wrote:
Hey guys,
I obtained a loaner iPad for a movie making competition I'm doing this week. Awesome device, but have one question.
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Although you aren't getting the "Unable to verify update" error mentioned in this article, you might try the same troubleshooting steps to see if they help with your problem: http://osxdaily.com/2013/11/15/fix-unable-to-verify-update-error-ios/.

I am trying to sync my iphone with itunes music and have selected 'entire music library', which shows a large amount of potential music data to be transferred. Trouble is after sync, the bar shrinks back to just the content of one particular Playlist!?

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How do i unsync my iphone from itunes library and sync it to a different one without wiping my phone

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Using two iPhones with iTunes - erase and sync message

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