lol, you obviously have no idea how phone systems work. Phone tunneling via VOIP is certainly possible, but it is NOT possible to receive a phone virus from answering a call. You should probably graduate middle school before posting online.
THIS IS A SCAM. This is a version of the advance-fee-for-something scam where something is a grant, grant paperwork, business plan, loan, scammed-money refund, lottery winnings, interest rate reduction, tax reduction, gift card, refund, doggie, cruise, vacation, free gas, etc., and the advance-fee is for tax, shipping, registration, insurance, secure handling, processing, etc. They may send you a fake check, may want your credit/debit card or bank account number, or tell you to wire cash via Western Union, Moneygram, etc. They can put recurrent difficult-to-cancel monthly charges or a 1-time charge on your card or bank account, and sell account info to other criminals and you'll have to replace accounts altogether. Wired-cash is irretrievable - once it's picked up at the other end, it's untraceable and gone. If they want you to call them up for instructions, they may tell you not to discuss the wire with Western Union desk clerks but the real reason is WU clerks are familiar with these scams and will warn you not to wire the money. If you give them the WU Money Transfer Control Number (MTCN) for the wire, they can pick up the money from anywhere in the world. Report to US Postal Service Inspectors https://postalinspectors.uspis.gov/forms/MailFraudComplaint.aspx , the Federal Communications Commission http://esupport.fcc.gov/complaints.htm , the Federal Trade Commission https://www.ftccomplaintassistant.gov/ and your state AG http://www.naag.org/current-attorneys-general.php as appropriate.
WOW!!!! That happened to me on the 16th of March and they stated the same thing saying that they work for the Government and that they been working for the US for 8 yrs and that to Western Union $300 dollars to them in order to get the $7000 out to my account. I told them they are not going to get a damn thing out of me cause a free grant is a free grant and can't no one in AMERICA get charge for a grant at all!!!
I just received the same call from 202-417-7606 stating they were from the US Government and I had received a $7000 grant. They had my name and an old address. When I told them they had the wrong address and that I moved 3 years ago and the US Goverment should have this information, they just hung up. The person spoke extremely broken english and I could barely understand them.