I want to travel from Seattle to Vancouver by Greyhound. I'm German and will travel to Seattle by plane and after a one night stay take the bus to Vancouver. As booking bus tickets in advance is much cheaper, I would like to purchase the ticket online in advance. I have the option to purchase a Print at Home ticket or Will Call ticket, but both of these options require me to enter an American-style telephone number which I do not have.

So, is it only possible to buy these tickets in advance if I have an American phone number?

I have read in another (German) forum that I can only buy Will Call tickets and no Print at Home tickets. Furthermore, they suggest to enter 999-999-9999 as telephone number, but I am not at all sure how reliable that information is.

Finally, if I understand the information at the greyhound website correctly, a Will Call ticket means that I can visit a Greyhound counter at the bus station in Seattle one or two hours in advance of my departure and get the ticket in exchange for a booking number. Is that correct?

Unfortunately, Greyhound support doesn't answer my emails, so I hope to be enlightened here :)