Enabling Wireless - This will require some hardware modification and will probably void warranty, do so at your own risk!
The following is more technical than the previous instructions. It assumes you know how to connect devices to your wireless network, configure them, and how to safely drill holes in metal. If you have any doubts on how to do this, STOP NOW and ask someone who does know what they are doing.

Open the case of your AntMiner S3. Identify the controller board, mounted on the top of the inside of the unit (where the network port is). On this board is mounted a smaller board containing an AR9331 system on chip. Near the bottom left corner of this board (Labelled ThinkPHY 2) is a U.FL antenna connector. You will need a suitable pigtail and antenna (both can be sourced from ebay for about $1.50 each, some of the most common are the U.FL to RP-SMA ones, and antennas are easy to find).
Carefully drill a hole the correct width for the pigtail to be mounted (do this without the board in the way, and ensure no metal filings end up in bad places), mount the antenna end of the pigtail in the case, then carefully and gently fit the U.FL connector to the antenna connector on the board.
Reassemble the unit, then attach the antenna to the pigtail's now protruding wireless antenna socket.

1. Power up the unit (connected by wire to your LAN) and confirm everything is functioning normally through the web interface.
2. Go to the Network tab, then select the Wifi subtab.
3. Next to Generic MAC80211 802.11bgn (radio0), click the Add button.
4. On the new page displayed, set the ESSID to your wireless network name, the mode to client, and set the appropriate security settings under the Wireless Security subtab (about half way down the page, near where you set the ESSID). Set the network to "Create" and call it wifi.
5. Click Save and Apply. (And wait a while for everything to apply)
6. Select the Interfaces subtab, there should now be a third network option called WIFI (along with the two original ones, LAN and WAN). Click the edit button for WIFI.
7. Change the protocol from Unmanaged to DHCP client. Set an appropriate hostname, then click Save and Apply again.
8. Confirm the AntMiner S3 has successfully associated to the wireless network and acquired an IP. If it has not, confirm your security settings are correct and check the device Kernel Logs from the Status page.
9. Once correctly associated, you should now be able to access the miner through its wireless network IP. If this is possible, disconnect the wired network connection and confirm the unit keeps mining.