Calls go straight to voicemail after one ring or no ring
Text messages stay as green bubbles instead of iMessage blue bubbles
iMessages show as “Delivered” never appearing
iMessages may not show “Read” receipts
FaceTime calls fail or do not connect
You cannot see the person’s profile photo or updates in Messages
Their status or online indicators stop appearing in apps that show them
Repeated attempts to call or message get no response across multiple methods
The contact still appears in your phone, but communication does not go through
A different number or account can sometimes reach them when yours cannot