How to delete names and numbers from the iphone?

I have the iphone 3s and i can sometimes delete names but not numbers and sometimes its the other way around. Its really frustrating because some of my friends get new numbers and i can't delete the old number so their name is in my phone two times and sometimes I pick the wrong one.

In you phone contacts. Go to edit and delete the ones you no longer want. You may also need to make sure iCloud or iTunes is also updated, whither system you back up to.

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