How do I transfer contacts from HTC Desire to iPhone 5?

I have a list of My old HTC Desire phone contacts I've managed to get to go onto Google mail, but I now have no idea how to get them to my iPhone. My iPhone has a list of contacts from my hotmail account, but they are all old email contacts and I cant seem to get rid of them?

I hope that makes sense? Any advice would be appreciated, thanks.