Original sentence: The ability to choose a public, changeable username instead of sharing one's phone number is a widely-requested feature.Users can send one-to-one and group messages, which can include files, voice notes, images and videos
Edited sentence: It uses the Internet to send one-to-one and group messages, which can include files, voice notes, images and videos.The ability to choose a public, changeable username instead of sharing one's phone number with everyone they message (or share a group with) is a widely-requested feature