Yes, they all come equipped with the standard modern plugin which looks like a small clear plastic square. If you need some other kind of plug give us a call. We can probably provide it.
Are they restored and fully functional?
Yes, and yes again. However, phone with cranks, while able to ring the bells, operate like a modern phone since most of us don't use party lines anymore. The Elite phone has a modern electronic ringer in the case unlike the original which used a separate oak ringer box. Those are exceeding difficult to find.
Can I use these old phones on the same line as new phones?
Yes, that is not a problem. However, old phones use more electricity to ring the bells so if you have half a dozen old phones on one line you may find that one of them fails to ring. If that happens, don't panic. There is a simple screwdriver adjustment that we can walk you through that will fix that.