Roy: Hello, IT. Have you tried turning it off and on again? [Sighs] OK, well, the button on the side, is it glowing? Yeah, you need to turn it on. Uh, the button turns it on. Yeah. You...Yeah...You do know how a button works, don't you? No, not on clothes.
Moss: Hello, IT. Yeah huh. Have you tried forcing an unexpected reboot?
Roy: No, no, there you go. No there you go. I just heard it come on. No, no, that's the music you hear when it comes on. No, that's the music you hear when... I'm sorry, are you from the past?
Moss: You see, the driver hooks a function by patching the system call table so it's not safe to unload unless another thread's about to jump in there and do its stuff And you don't want to end up in the middle of invalid memory. [Laughs]. Hello?
Roy: It's like they're all pally-wally when there's a problem with their printer, but once it's fixed-
Moss: They toss us away like yesterday's jam.
Roy: Yes! Yesterday's jam! That is what we are to them. Actually, you know what. That doesn't really work as a thing, because jam lasts for ages.
Answer: It's a joke on the "118" numbers in the UK. 118 numbers were used for directory enquiries and adverts for them on TV always tried to give a way to easily remember one for a particular company. The fake ad in the show takes it to the extreme. People in the UK do not use "911", the point of the joke was that Roy had forgotten "999" while saying it was easy to remember.