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Did you follow the suggestions in this article?
iOS 4: Updating your device to iOS 5 or later
Has the software on the phone been modified in the past?
Unauthorized modification of iOS has been a major source of instability, disruption of services, and other issues
not sure and not sure
are you able to help me with this issue
Read page 14 of http://manuals.info.apple.com/en_US/iphone_user_guide.pdf
Always need to insert SIM, active or inactive from the original carrier in the iPhone to activate.
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