My iPhone 4 will not recognize my caldav account after changing my yahoo password, if I wipe the phone

IF I wipe my iPhone & reinstall my apps, will they have the information I put in them in the past?

Hello Sara
Check out the articles below to get your iPhone to show back up in iTunes to get you syncing again.
iOS: 'Trust This Computer' alert
http://support.apple.com/kb/HT5868
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
Thanks for using Apple Support Communities.
Regards,
-Norm G.

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