IPhone showing searching even when SIM card put in?

I got this iPhone 4S from a cousin in USA
I live In India
She had put her sim in it earlier but when she gave me I put my sim In it but still it's showing searching even after putting the sim I can use the internet as well as I can call someone and receive calls then y is it showing searching? What to do about it?

My guess is that the phone is still "locked" into the carrier in US. You probably need to "unlock" the phone so it'll show the cell network/carrier's name on the iPhone

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