The telephone number 1-855-739-7819 is currently being used by cybercriminals to trick Gmail users into calling it. If potential victims call the same telephone number they will be asked for their email account credentials (usernames and passwords) and may also be asked for credit card and other sensitive information. And, once the cybercriminals have gotten their victims' account and personal information, they will use it to hijack their accounts and use them fraudulently.
A Sample of a Fraudulent Email Asking to Call 1-855-739-7819
From: "Gmail Security" <77886119.E3E9AFA8B7B1A3E623D314aqtfotvzoijryic@ykgpfgyilfrzakr.com>
Date: February 2, 2018 at 12:10:57 CST
To: mebakotic@gmail.com
Subject: Your IP Is At Risk
You need to call now 1 855-739-7819
We Have Detected Unusual Activity With Your Gmail Account on Your Computer
Login Has Occurred on 2/2/2018 @ 9:06 AM EST
From IP: 34.124.12.1 Geo Location Found: Eastern Russia
If This Was Not You Please Call the Google Security Team
(Be at your computer)
1 855-739-7819
Gmail users who have already received the phishing email messages, and who have followed the instructions in them, are asked to change their Gmail account passwords immediately before their accounts are hijacked by cybercriminals and used fraudulently. And, if they gave out their credit card information, they asked to contact their bank for help. They should let their banks know that they were tricked by a phishing email and unknowingly gave their credit card information to cybercriminals.