Did you buy one of the iPhone + Carrier subscription offerings on Amazon? If so, it says right on the Amazon product page title that the phone is locked: "iPhone [Locked] + Carrier Subscription".

You're stuck on Cricket for 6 months or return the phone back to Amazon and cancel the purchase. I'm not sure why you'd believe some idiot at Cricket over the amazon product page that clearly says it's locked.

https://www.amazon.com/Apple-iPhone-Graphite-Carrier-Subscription/dp/B09G9TX631/ref=sr_1_4?keywords=iPhone+13+cricket&qid=1637255704&qsid=147-2827207-0677963&s=electronics&sr=1-4&sres=B09G9TX631%2CB09G941MJG%2CB07P9765VS%2CB09G9F5RH5%2CB08PND2PGV%2CB07JZVMF9Q%2CB07TCB63RL%2CB09D8WY8B8%2CB09CSSP9C1%2CB08KYX5RSR%2CB099DNGHBM%2CB09CSYNDMH%2CB08RZ4D19Y%2CB08PMP778K%2CB09BZRM3RV%2CB08PNN2SKF%2CB09BN2V4ZD%2CB0967LF6KW%2CB07ZPKZSSC%2CB09CTB3M1T&srpt=CELLULAR_PHONE