I have a SS watch and I normally use sport loops. For formal events I switch to a fitting SS or leather band

It’s not about iPhones or carriers, the only thing that matters is the account (Apple ID). If it is locked to one account, it needs to be removed from said account or it won’t work. This also shows, that your watch is not brand new. It must’ve been used at one point, even if it was just for a short time.

If it says iWatch on it, it’s probably fake and not waterproof

This is a very easy repair, the battery is held in with just one screw, a new one costs like 15$. To close it back up you need an adhesive strip, you can buy those pre cut and ready to install for about 10$ shipped. Any phone repair shop can help you with that, or you can do it yourself. There are great video tutorials online explaining every step.

It’s kinda funny, that they ask you if you got it wet. It’s the Ultra, it’s literally made for diving, lol

Yes, for sure, I’m leaving my phone at home as often as possible. I only really take it with me when I go to work or any trip that lasts longer than a few hours. Before, I was pretty much glued to my phone

Get your battery replaced, it makes a big difference