If you would like to change the standard ringtone to iPhone, then I can recommend any of these three programs for creating ringtones. There are not many special differences between them, they all work according to the same principle. So, the criterion like not like it is exclusively subjective.
Detailed instructions on how to install ringtone on iphone.
Ringtones
You need to select a fragment from the music track, and then the program will do everything by itself.
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Install from AppStore
RingTunes
Likewise in RingTunes.
Install from AppStore
RMakerPro
This program has the ability to apply effects to the original audio recording. This can increase the playback speed or change the timbre of the artist's voice.