Some Android games and application require a Wi-Fi connection due to the large amount of data that they use. If you don't have Wi-Fi available, however, you won't be able to use the apps or play the games, even if you have a fast 3G connection. You can trick your phone into believing that the Wi-Fi is connected by saving a small text file to your SD card so the phone will play games and apps as if it's on Wi-Fi when it's only connected to 3G.
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Launch a text editing program on your computer and type "FALSE" in all caps. Save the file and give it the name "qaWifiOnlyMode.txt" exactly with all the lower-case and capital letters duplicated precisely, otherwise the Android operating system won't see the file. Close the text editing program.
Plug your Android device into your computer and drag your finger down from the top of the screen to open the notification area. Tap "USB Connected" and then confirm that you want to mount your SD card as a drive on the computer.
Find the qaWifiOnlyMode.txt file on your computer and click to select it. Press "Ctrl" and "C" to copy the file. Browse to the location of your Android device's SD card on your computer. In the base directory, not in any sub-folder, press "Ctrl" and "V" to paste the text file to the card.
Drag down the notification area on your Android device and tap the USB connection to disconnect the device from the computer. Unplug the USB cable. Your device will now play games and apps as if it's on Wi-Fi even if it's only on 3G.