Pretty much every phone after 2009/2010 uses the same digital protocol. So yes, it should get call service until the standard changes again. It kind of has half way through 4G. High definition calls on iPhone use data. But they still rely on digital phone for the most part.

Looks like soap residue irritation

I have ulnar damage in my elbow for other reasons. But I have a GSHOK looking case/band for my Ultra, and I wear it loose. But sometimes I wake up with the feeling of higher blood pressure in my hand, and the watch has wedged up my arm to the point of being tight again. I miss the elastic Ultra band. But I like the aftermarket case bands. The classic watch buckles just kind of suck once you’ve used the Apple styles.

Your lens has finger grease on it. Wiping it with your shirt might be good enough in daylight, but you need alcohol to get it off at night. The lenses and screen start out with an oleophobic coating that wears off in a year or less. Always use a screen protector and lens protector. Because you can replace those when they wear.