and when you plugged it into your home mac how did it behave? did u have to restore iphone?
When plugged into my iMac & itunes, I had signal from O2 on both EDGE and 3G (full 5 bars), and it started syncing my content!
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No, not at first, but If you do get one, I suggest it.
The iPhone 3G comes with a earlier firmware (5A345), rather than the officially released GM version (5A347).
The firmware when vanilla from the store, was buggy.
Restoring helped.
I was not forced to restore, I chose to, to improve performance
.
Sitting here after the restore, some keyboard and lagging issues are still there, but it's much more responsive.
R-Fly