Caller ID displays who is calling, so you know who is calling before you answer them.
For unknown numbers that are not in your device contact list, you can see the name and social network photo of the person calling. This will appear after you answer the call as well.
Here’s the screen for a missed call.
Press the bottom left to block spam callers. If enough users block a certain number this will appear as Spam for other users.
Press the + in the middle to add this number to your contact.
If the number was wrongly identified, you can edit the contact – change the contact’s name, as well as identify if the call was from an individual person or a company.
The feature is also available for SMS/text messages, so you can see who is sending you messages.