First of all: Yes, it works WITHOUT jailbreak and other weird things. I wrote the instructions because I was interested in how to do it myself. In my case, Duke Nukem ringtone MP3s, which I received as a bonus at a "Duke Nukem Action", were supposed to be used as SMS tones on my iPhone 5. The operation was also successful, but I have to admit that it is a bit irritating whenever someone says "Heil to the King, Baby!" When a new text message arrives.
But whatever you want to use it for: here are the instructions on how to do it in principle:
Have fun with it!
If you would like to see the whole thing as a screencast in order to follow the individual steps directly on the monitor, you can watch this YouTube video. The creator went out of their way to explain everything:
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.