Google Play Music

When it comes to streaming services, Google Play Music is one of the best options for both Android and iOS. Perhaps its single greatest feature is the fact that you can upload as many as 50,000 of your own songs to Google's servers, then stream your library to any device without ever paying a dime.

It's always a pain to make sure you have enough storage on your smartphone. Pictures and videos occupy a lot of space, so your music library has to take a back seat—otherwise, you might see that pesky "Storage Full" notification at any time.