Can I use my old Iphone for listening offline?

[t24b24]

I am about to upgrade to a new Iphone 5s.   I currently use my iphone 4 for listening to spotify songs offline while running. Can I continue to use my iphone 4 to listen to spotify offline after I change my wireless account over to my new Iphone 5s?  Can I sync spotify with my old phone via my desktop in order to maintain my playlists without a connection to a wirless account?  Or does my old phone need to be able to connect to the internet? 

[Joe]

As long as you don't exceed the three device limit, there's no reason why you can't use two iphones for spotify. You should be able to synch your old phone over wifi as currently.