Hi there, leyna64,
Thanks for visiting the Apple Support Communities to get help with the Caller ID feature. Typically, Caller ID for incoming calls is handled by the person calling you, not by your device. Additionally, this is a feature provided and supported by your wireless carrier. We want to offer some troubleshooting steps to ensure your iPhone is working as expected, but you may need to partner with your wireless carrier, or the people calling you, to get a resolution.
Let's start with the steps below, though. They will help us rule out possible causes, and narrow down a solution:
- Restart your iPhone: Restart your iPhone - Apple Support
- See if you have the ability to adjust Caller ID settings in Settings > Phone: Make a call on iPhone - Apple Support
- Check for, and install, any available iOS updates: Update your iPhone, iPad, or iPod touch - Apple Support
- Check for, and install, any available carrier settings updates: Manually update your carrier settings on your iPhone or iPad - Apple Support
If you're still receiving anonymous calls after that, please get in touch with your wireless carrier. Should you need more help after speaking with them, you can reach out to Apple Support directly here: Get Support. They will have access to additional tools and resources to confirm your iPhone is functioning as expected.
Take care.