@Tnoo Thank you for visiting and posting on the Cricket Community Forum! Unfortunately, we do not service the Samsung Galaxy watch.
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Cricket is owned by and uses the AT&T network and servers. Not supporting smartwatches is therefore a conscious business decision designed to force their consumers to pay for the higher tiered (and higher priced) AT&T service. I can't say I blame them from an economic standpoint, but from a consumer viewpoint it has pushed me to cancel my service and give my money to their competitor instead.