Currently Being ModeratedNov 30, 2012 4:53 PM (in response to chunker)
Turn Home Sharing on in iTunes first. To do that go to File > Home Sharing > Turn on Home Sharing (this is for iTunes 11) If you are using an older iTunes, go to Advanced > Home Sharing > Turn on Home Sharing
Now on your phone, go to Settings > Music > Home Sharing and enter the same Apple ID and password. I hope this helps.