IPhone 4s stuck on searching after screen replacement?

So i replaced my moms phone screen last night, and everything was working fine but a minute later the signal went to "Searching". The Wi-Fi still works just no cellular. I factory reseted her iphone cause people said that would help but now it won't activate cause its still on searching.

You've torched the activation. Contact the provider to get a new SIM and re-activate the phone.

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