Tap the grey app with gears on it to do so. It's in the same group of settings as the General option. On the iPhone 6S and earlier, you'll just tap Sounds here. This option is directly below the "SOUNDS AND VIBRATION PATTERNS" heading in the middle of the page. In the "RINGTONES" section, tap the name of the ringtone that you want to set as your phone's default ringtone. You should see a blue checkmark appear to the left of it, signifying that your phone will use your custom ringtone for all incoming calls. If you'd rather set the ringtone for a specific contact, do the following:  Open the Contacts app. Tap a contact's name. Tap Ringtone  Select the ringtone. Tap Done
आइफोन की सेटिंग खोलें: नीचे तक स्क्रॉल करें और Sounds & Haptics पर टैप करें: Ringtone पर टैप करें: अपनी रिंगटोन के नाम पर टैप करें: अपनी इस नयी रिंगटोन को किसी एक कांटेक्ट के लिए सेट करना :