Cricket is an AT&T MVNO so it's the same network.
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Cricket was a Sprint mvno. Not all cricket phones will work on att. The cricket 5c will work though as it contains both cdma and gsm radios
If it was a cricket 5c designed to work on Sprint then it would be the a1456 model. If it was an att then it would be the a1532 mosel
dpham00, Android Central Moderator
Sent from my Verizon Moto G