I have issue about activation error

Did you already try the troubleshooting mentioned in this article?

If you can't activate your iPhone - Apple Support

Also, if your info about your device is correct, iOS 7 might not be supported anymore.

eijun Said:

"I have issue about activation error"

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Time to Upgrade:

It's an obsolete phone. so, I'd say its time to upgrade. It my just not go through.