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.
Per corporate Cricket store in Reno, NV, as of 10JUN19, no you can NOT use Apple Watch series 4 GPS + cellular on their network. Answered by Matthew N from Reno. Jun 10, 2019.
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 ...
But it gets worse, the Cricket version is locked for 6 months after purchase vs unlocked immediately with Apple, there is a $25 upgrade fee on Cricket, and you don't get all the colors on Cricket(probably not a big deal but if I'm paying this much for a phone I want to pick the color I want).
On your iPhone, open the Apple Watch app. Tap the My Watch tab, then tap Cellular. Your Apple Watch should automatically switch to the carrier that your iPhone is using. If you need to add a new plan, tap Add a New Plan, then follow the onscreen steps. If your previous plan still appears in the Apple Watch app, you can remove it.
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.*.
Open Control Center on your iPhone, then make sure Wi-Fi and Bluetooth are on. Your Apple Watch uses Wi-Fi and Bluetooth to communicate with your paired iPhone. If you have cellular, your watch can also stay connected through a cellular network. Your watch switches between these intelligently to choose the most power-efficient connection.
no 5G after plan upgrade. Been with Cricket almost 10 years and just upgraded to the Unlimited with 5G plan for iPhone 12 - however it’s not working. It’s been 3 days and I’m still on LTE (which seems even slower now) Restarted the phone multiple times, removed and inserted the SIM card and all that to no avail.