China Unicom is a ringtone service. If you want to order a ringtone, you can log in to China Unicom’s ringtone website to order your favorite ringtone songs. You can search for related songs according to the page prompts and order them. After ordering, you can go to the "Personal Center" ” → “Xuanling Management” → “Xuanling Library” → “Ordered Xuanling Singles” → Click Settings → Follow the page prompts to set the playback order of Xuanling songs.