How to fix an iPhone 5c that won't activate?

I recently acquired a used Apple iPhone 5c, which will not activate. Different service providers tried different SIM cards, none of which solved the problem The phone itself won't even go past the activation screen.

What could be the problem, and is it easily fixable?

It might have been a stolen phone

Basically means you got a stolen phone. So whoever gave you the phone probably stole it from someone.

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