The problem with having a popular phone like an iPhone is that, by default, everyone has the same ringtone. If you want to give your iPhone a more personal sound, here’s how to do it.
Go to Settings > Sounds & Haptics on your iPhone.
On the Sounds & Haptics page, select the "Ringtone" option (there are also options here to change other tones, like text messages, new emails, and so on). On the Ringtone page, tap the different ringtones to hear them play.
When you find one you like, tap the back button to save it.
If you want something even more custom, you can buy additional tones in the iTunes Store or even create your own—my colleague Chris has written a great guide on how to do it so check it out if you want a full walk through of the process. Personally, I use LMFAO’s Sexy and I Know It.
You can also assign individual contacts their own ringtone. This is great if you want to screen someone’s calls or be alerted as soon as a family member calls. You can even use a silent ringtone if you ever want to silence calls, but not text messages or notifications.