I too just realized all of this BS as I purchased a Series 3 for my daughter as she is starting to leave the nest with out us. I was told by a number of apple personal at the apple store and by multiple AT&T reps that as long as I had an iPhone 6 - it WILL WORK. So do they not know the new watches were shipped with the most up to date WatchOS that puts them incompatible with the Series 3? Look - we all have spare phones as we upgrade and those are the perfect phone to pair the watch with for your children. Can't have them paired to mine or my wife's for obvious reason...not to mention your apple ID. To the "Elitegate" - your handle says it all... don't judge others and their thinking without you knowing anything about them, their thoughts, and the processes for this purchase. I have found, on apple's website, that they still shows the iPhone 6 is compatible with the series 3 watch as it is dated 2018 so don't say Apple has not stated it as they have by their inability to remove aged content on their website.
I just spent 4 hours on AT&T to get this figured out as AT&T assured me that my iPhone 6 can be paired - I have spoken to two high level engineers and they do not believe what I have found on the apple website (updated content) that states it can't be paired unless I have an iPhone 6s or higher. I was just disconnected as the engineer has to save face as they must have just realized I am correct. Wow - 4 hours down the tube.
Lets start with the BS of why does it have to be paired in the first place? If I want to struggle to set it up without a phone - that should be on me. Just need this device to send and receive texts and to phone out - thats it! That is why I paid an extra $100 to have cell service on it. I should not need a phone! But now I need a $1000 plus device to make this happen along with the $300 watch - Apple please....
I have been a loyal Apple supporter since the 80's and have owned over 40 Apple devices and this, the lack of communication regarding this update and what it will do, well before WatchOS 6 came out to its partners, resellers, and customers in not just....its just wrong!