3G on my iPhone 4 isn't working?
My phone was lagging a lot so I did a factory reset on it. When it finally came back on after the reset, my 3G was on, but I couldn't do anything (iMessage, Facebook, Internet). I was never connected to Wi-Fi before in my house and was able to use the 3G perfectly.
Check the settings for it. The APN settings in particular. May have changed since you restored it.
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