Left a message claiming to be from Verizon regarding a critical issue with my account. Told me to call 1 877 936 1170 and give them my telephone number as a "reference" to the account issue.
Signed into MyVerizon account to discover that no problems exist with account and spoke with representative who thought it was probably an attempt to collect account information.  Always call your telcom carrier, credit card company, or bank before responding to suspicious alerts.