Pick up the phone
How would you say in German the following phrases:
— Pick up the phone! It is ringing already 10 minutes!
— Could you answer the phone, I'm a little busy at the moment.
— This is useless to call them. They never answer the phone.
In Russian there is a construction, that could be literally translated as "come to a phone", which means "answer tthe phone". Do we have something similar in German?
Also in German there is a word "das Apparat" (— Wer ist beim Apparat?). How could one use this word and especially in the previous contexts.