視訊的畫質並沒有受到多大的影響，不過受限於 3G 網路的訊號或較不穩定的連線品質，視訊影像的格數，可能會比不上經由 WiFi 來得流暢。
安裝步驟：
1) Jailbreak your iPhone 4 via www.jailbreakme.com.
2) Download and upgrade to the latest Cydia package.
3) Open Cydia, Go to Manage then Sources.
4) Click Sources, Edit then add: http://apt.modmyi.com
5) Search for "My3G" -- download, and install it.
6) Go through the Rock setup process with a username and password. Open My3G and leave all settings on the default.
7) FaceTime should now work over 3G! -- Make sure to "Forget" the WiFi network you are on (via iOS settings) if you want to test it.
還可以在 SBSettings 下方便切換。
測試 Skype 的通話。
My3G 安裝後，實際使用的影片：
引用 9to5mac 、 rockyourphone