LG and South Korea carrier LG U plus are working together on the LG G watch with a Build-in SIM., According to inews24.com, LG U+ will be the first to release the LG G Watch with cellular capabilities.
There are two model variants of the LG G watch, According to a database entry on LG Official website. The G watch with a build-in SIM for LG U Plus come with model number LG-W105L, The international version of the G watch has been spotted in FCC filling and LG database with model number LG-W100.
At this time, we know that the LG G watch (LG-W100) will be available in U.S., UK and South Korea. We did not find any U.S carrier entry in the LG G watch (LG-W105) listings.
LG might release the G watch that with a built-in SIM in the U.S some time in not long future.