If you’re like most people, you use your iPhone to keep in touch with friends and family. But sometimes, you might want to contact someone who you’ve blocked on your phone. Here’s how to see who you have blocked on your iPhone. To block someone on your iPhone, open the Settings app and tap “Blocked Contacts.” Then, scroll down and tap the person you want to block. To unblock someone, tap the person’s name and then tap “Unblock.” ..