Just a friendly reminder a few of android wear 2.0 watches and Samsung Gear S3 had the LTE for a while now
If you are looking for an LTE enabled smartwatch, do checkout either the LG Sport Watch or the Gear S3.
while Apple Watch series 3 seems great, the LTE talk time is only 1 hour (standalone time), while Gear S3 is 2-2.5 hours. This is because Gear S3 has a much bigger battery and can last longer than the Apple Watch regardless of talk time or not. Apple watch has about 1-2 days of usage if you dont do much, whereas the Gear S3 can get you 3-4 days, so roughly x2 the days. I do have to say though, the Gear S3 is one big ass watch, it is what deterred me from buying it when it came out. Not for people with small wrist, thats for sure. I have not seen or tried the LG Sport Watch in person so I dont know much about that, but it does look slimmer.