Depending on how you want to define time travel, Haldeman's The Forever War may fit this bill. IIRC, the main character didn't specifically set out to travel through time, but as a side effect of their method of space travel, quite a bit of time passed while they were in transit. I believe space travel worked much the same in Card's Enderverse, though I'm not sure they ever returned to the same planets after traveling in the narrative itself, so the effect may not have been visible (not counting travel inside a particular system). Also thinking one of Bester's short stories may have dealt with only forward time travel, and of a more deliberate sort, but I'm drawing a blank as to which one, so I could be mistaken.

At least they're decent length pages here, with information and images, rather than pages with only two or three paragraphs each and the rest just covered in ads.

I guess that's probably why I get a lot of hang-ups when I answer unknown calls at work, I say more than just 'Hello?' since I'm answering for a business, and I usually hear a click after a second and a dead line. Unfortunately, I don't have the option to just ignore them, since some of our clients and even an employee call from unknown numbers.

I always tell people calling from phone companies that we don't have a phone. They never quite know what to say to that. Other annoying salesmen get directed to the warehouse cat, who never seems available for a phone call.

The main problem I see, even with the do not call list, is enforcement of it. When I answer without looking at the caller ID first, and it's a telemarketer, they just hang up when you ask for their information, so it's hard to turn them in. I suppose I could play along to get their info, but hanging up is just easier.