My iPhone 4 keeps deleting contacts?

I got a new phone yesterday, so I put all my contacts in from my old Samsung (manually). However… Today my iPhone keeps deleting them and I'm sick of it!
Is there a way I can transfer my contacts from my Samsung onto my iPhone 4? Or is there a way to stop having it delete my contacts every time I put one in?

Added (1). I entered each contact from my old phone manually. I don't know why my iPhone keeps deleting them…

That's not possible lol. U probably didn't really transfer the contacts

I used to have a similar problem with iphone contacts disappearing from my contact list. This helped me sort it out:

http://iphone-contacts.over-blog.com/article-iphone-contacts-disappear-106829462.html

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