Cricket is not currently listed by Apple as a carrier that offers compatible service plans: Apple Watch - Carriers - Apple. I suggest that you contact Cricket to ask about their plans for supporting Apple Watch Series 3 (GPS + Cellular). You can also monitor the page linked above for further carriers being added over time.
Answered 2 years ago. Yes it will. As long as the iPhone supports a particular service provider then the Apple Watch will work however if you are looking at getting cellular directly on your watch so you can still receive messages, ect then you have to check to see if cricket has a plan add-on that allows that.
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Cricket is owned by AT&T and presumably shares AT&T’s network with all its capabilities. If they’re not offering Apple Watch support, it’s an intentional business decision to motivate higher-end/Apple Watch users to pay for the premium AT&T service.
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BYOD devices must be HD Voice capable but also compatible with Cricket’s HD Voice network to activate service. Not all bring your own device (BYOD) phones will work on Cricket’s network. Below is a partial list of BYODs that are compatible with the Cricket network.
Apple Watch Series 7 and Apple Watch SE cellular models with an active service plan allow you to make calls, send texts, and so much more — all without your iPhone. You can complete a call to emergency services when you’re traveling abroad just by pressing and holding the side button. 1 And now with Family Setup, members of your family who ...
To activate a device on the Cricket network, you'll need an HD Voice-capable smartphone that is compatible with the Cricket HD Voice network. This includes HD Voice-capable devices from Cricket. BYOD (bring your own device) compatibility can be found here. Not all phones brought to Cricket will work on Cricket’s HD Voice network.*.
So this doesn't seem possible on cricket in the same way that it is possible on postpaid solutions because while you could put a sim in the watch from cricket, it will have a completely different phone number from your actual phone so I think it's kinda pointless, better off just getting a non cellular SIM watch and a Bluetooth only one like an Apple Watch, and I think even the sim watches are Bluetooth as well because they do both, so just use the Bluetooth only