How to reverse hacktivation on my iPhone 4?

Years ago, I bought an iPhone 4, and it doesn't include a SIM. Because you can't activate an iPhone without a SIM, I hacktivated it months ago (when it was ios6). Yesterday, I went to a phone service center to cut my full SIM from my old phone. I insert the SIM into my hacktivated iPhone, and factory reset the iPhone. I thought it would add the intro where you have to set your Wi-Fi, country, language, etc. It seems like that it doesn't include the intro, since I deleted that part. I remove the SIM from the iPhone, and it just says "Insert SIM Card to activate iPhone" on the lock screen after I restart the iPhone. I can still use the iPhone.

Now the problem is, how do I reverse hacktivation on my iPhone 4? (No S) Do I need to download the intro from some link? What do I do? Please help me.

Added (1). I'm from Malaysia. The carrier I'm using is Celcom.

Its att, what carrier r you trying to use it on?

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