I used to do customer service for UPS.
Yes, business deliverys ALWAYS require a signature,
Yes, they are allowed to leave packages at apartments if the sender doesnt require a sig. It's up to the judgement of the driver (which means yes, they will leave it at your apartment)
This has always been a big problem. Some drivers seem to leave them with neighbors with no notice to do so. A very small % of drivers will hardly EVER leave your package if you live in an apartment.
No, Tmobile has NEVER requried a signature for there delivery's.
Yes, TONS of people called in regarding the whereabouts of there tmobile phones over the years I worked there. A lot of them were stolen (by the driver in some cases, but probably the neighbors in the majority)
My front door was wide open with the screen door closed and my nexus was just sat right on my front door with a ring on the doorbell and a walk off. I tried to say thanks to the driver but he didn't hear me. So I ran inside, tore off the packaging and stared at the little box in awe.
Side note hint: NEVER do a will-call on a signature-required delivery until the package has at least been attempted. or it wont get attempted, even if on a truck and out for delivery. But in this case, it doesn't matter, because it doesn't require a signature anyway.