Open the Phone app
Tap Recents
Check for missed calls from blocked numbers
Open the Messages app
Tap the conversation list
Look for any messages that may have come through before the number was blocked
Open Settings
Tap Messages
Tap Blocked Contacts
Review the blocked numbers list
Open Settings
Tap Phone
Tap Blocked Contacts
Review blocked callers
Open Settings
Tap FaceTime
Tap Blocked Contacts
Review blocked FaceTime contacts
Check voicemail for blocked callers
Use a third-party spam filter app if installed
Contact your carrier for blocked call or message logs