put (something) in service
To make something functional and able to be used by others. We need to restore power before we can put this part of the railway back in service. A: "Sorry, the elevator isn't working." B: "When will you be able to put it in service?"
put something in (to) service
and put something into useto start to use a thing; to make a device operate and function. I hope that they are able to put the elevator into service again soon. I am tired of climbing stairs. We will put it in service within an hour. When can we put the new copier into use?