I'm trying to use my at&t SIM card in a cricket Coolpad phone when I put my SIM card in the phone and turn it on it's asking f

[banderson238580]

I put my at&t SIM card into a cricket Coolpad phone when I turn the phone on it's asking for a sim network unlock pin how do I get the pin. The phone is a cricket Coolpad phone cp3636a

 

[rgd1101]

contact cricket for the unlock pin