I am using 4s but after taking update to to ios8.4 i could not active my phone. When I go for active my phone . It shows "Device unknown " massage.
iPhone 4S
Was it jailbroken or "unlocked" by someone other than the original carrier?
No it was not jailbroken and its not locked by another people.
Put it in DFU mode and restore iOS using iTunes.
What is DFU mode?
You can find that information here.
I could not active my I phone 4s. And when serch my imei number it shows that this imei has been replaced. And I bought my phone from abroad. And there is no I phone customer care in Bangladesh.when I connect my phone with I tunes it shows this message " there is a problem in this phone. So how I will active my phone?
You won't activate it. Recycle it and buy a new phone. You bought a phone that was replaced by Apple service and not returned, or stolen in transit (or from Apple stock).
Apple won't touch or support that phone at all, regardless of what country it came from or where you are.
It can not be activated.
I could not active my phone
