Phone [Q] How to detect my phone.

I would have liked to have a NFC tag sticker stuck to my door-frame. It would have told my phone to send a message to my server when I walk in the room. I have recently found out that NFC tags don't have that much range. Is there any other way to detect when my Galexy s3 enters the room, or can I extend the NFC range? I'm looking for a range of about 4-5 inches. Are there NFC tags that work that far away? Any response would be appreciated. Thanks!