homes usa! calls on cell phone, how do they get our cell phone numbers?

They stated I will receive a gas card for $200.00

Multiple text messages received on my cell phone saying I've won a $200 gas voucher and a $20 gift card.  Make it stop.

THIS IS A SCAM. This is the advance-fee-for-something scam where something is a grant, loan, lottery winnings, interest rate reduction, gift card, doggie, cruise, vacation, free gas, etc., and the advance-fee is for tax, shipping, registration, secure handling, service, 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 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. 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, as appropriate.