If the phone immediately hangs up or beeps rapidly, then either the line is busy or the contact blocked you through their carrier. If the phone gives the error “Your call could not be completed as dialed”, they could have changed their number or blocked you through your carrier. Of course, if the contact answers your call, you haven’t been blocked.
If your call still ends after a ring or less and diverts to voicemail, your contact’s phone is definitively dead or blocking your calls.
If the call goes through like usual–e. g. , five or more rings–then your contact has blocked your number. If the call still stops after a ring or less and diverts to voicemail, your contact’s phone is dead.
Most people won’t pick up if they see a “Restricted” or “Unknown” number calling them; this is because telemarketers often use this tactic to reach numbers on the do-not-call list.
