I have the U8 watc, bought it from Wish.
Long story short, the phone pairs very easily with my iPhone 5s but the only features that sync are sounds and the phone itself. So that means any notifications you have setup on your iPhone you will hear on the watch, including mail and messages HOWEVER you can't read them. The main reason I bought this was so I could read my messages without taking the phone out of my pocket (yep, lazy!) so this kinda *****.
I tried all of the apps that are suggested in these posts but none work. The one I was most excited about trying was BT Swatch but as soon as I open that app on my iPhone it says "Smart Watch Alert [(null)] Disconnected". The only option to tap is Dismiss. When I try adding a device I basically go through a loop of the previous message.
As for MediaTek, I tried it too. Interestingly enough, it detects two available connections both named Apple TV (I do have an Apple TV). I tried connecting to both hoping that one was my U8 watch and something was just wrong with the naming . As soon as I connect it looks like it may start working but about 10 seconds later it justs disconnects and reconnects, obviously not working there...maybe my Apple TV is walking around without me knowing about it?
After reseting the watch. To my surprise it reconnected (paired) to my iPhone automatically however everything else (time/date/location) reset.
I'd love for this thing to show me my texts and emails. If anyone can get it working with an iPhone please please please let me know!
Alex