On syncing my iPhone contacts with yahoo through iTunes it came up that it was going to add 20 contacts, modify 21 and delete 113. As I only have 172 contacts on my phone I was worried that it would take off 113 contacts from my phone.

How do I do this?

Thanks

The first thing to remember is that if you're adding contacts from a different source, the iPhone will acknowledge this and put them in a different folder. Following this; you'll likely have two folders on your iPhone:

iPhone Contacts
Yahoo Contacts

Things get more complicated when there are identical contacts on both sources (which is probably what is causing the modify and delete statements).

I'm confused 