Lte is long-term evolution,” it is used to describe the particular type of 4G that delivers the fastest mobile internet experience.
So for famous smartwatch brands ,if you use LTE watch ,your smartwatch will be like a smartphone,they use LTE watches , When your mobile phone is off or out of range,Your smartwatch can use a Wifi network to send and receive data. You can listen music,
When you go out and running, you can left your watches in home, Your watch can also connect to a cellular network if it’s a cellular model.Make and answer phone calls. You need connected to Wi-Fi or cellular, but it doesn’t need to be nearby your sumsung ,Apple watch , use LTE smartwatch , smartwatch with their own internet , it is more convenient,
So for all of your questions ,there is answer .
1.Can I use my Apple watch if I leave my phone at home?
Yes ,if you use LTE smartwatch,You must be connected to a Wi-Fi or mobile network.
2.Can I use my Samsung watch if I leave my phone at home?
Yes, if you use LTE Samsung watch ,Your watch can connect to a cellular network,then like a small smartphone.