But there are ones that don't require a phone at all? I haven't seen any, could you list a couple?
To the many noting that that there are smartwatches with LTE that can be separated from a phone but still require a phone, I'm aware of these. I'm looking to see if there are smartwatches that don't require a phone *at all.*
The quintessential example was the
Neptune Pine. Unfortunately, it's largely representative of the completely independent smartwatches released since -- it's big, bulky and requires all kinds of compromises. I've seen some smaller Chinese devices that claim to be independent, but they tend to be Apple Watch knock-offs with poor specs (slow MediaTek chips and tiny amounts of built-in storage) and hacked-together interfaces. Look for "Android smartwatch" on Amazon and you'll see some of them.
The problem, as I see it, is that doing a truly independent smartwatch
well is difficult. You need a device sized like a conventional watch, but with good performance and a battery that can last all day on cellular. You need an interface that's genuinely well-suited to your wrist, but powerful enough that you can easily handle most common tasks without needing a phone. And we're not there yet -- truly well-made smartwatches don't have the battery life or full independence, while the watches that are independent don't have the performance or the interface.
Right now, the best solution is a cellular-equipped watch that lets you leave your phone at home at least some of the time... say, when you're working out or just want to make a quick trip to the store. It'll be a few years before you can always leave your phone at home or ditch the phone entirely.