Found this number on my caller id.

got a text to call this number to claim a giftcard.

I just received the same text from 650.305.0301. When I looked it up it said it was from Los Altos, CA.The message mentions a number to call to unsubscribe (415.513.5459) which comes up as San Francisco. This is very upsetting, it is the second time something like this has happened with my cell phone. I'm going to check with my service provider.

Got a text from 650-305-0301 directing me to call 877-603-5284 to receive a $100 WalMart gift card. No company info of website given. Did not respond but went to the National Do Not Call Registry www.donotcall.gov and filed a complaint.

9/10/10 - Just received the same text from 408-667-6673 with the same callback number, etc.  Located this info on the calling number (see below):

Prefix    (408)-667
Records in    San Jose / OAKLAND (95035)
CLLI    OKLECAZVGT0
DST Observance    Y
US Timezone    PT
Block Leased By    6529 (T-MOBILE USA INC / T-MOBILE)

Went on T-Mobile's site to determine how to report 'Smishing' - send mailto:privacy@T-Mobile.com.  If everyone is diligent in reporting this to T-Mobile, maybe they'll take action against the person(s) behind these stupid texts!

09/10/10
just received the same text! some indian woman answered only saying hello! asked why i was calling! i knew something was up! would not give her my last name. she then said that i had to pay for the shipping of the prizes which was two dollars! i hung up and googled right away and found this site. totally going to report this! thanks everyone for leaving comments!

TEXT MESSAGE: Thx 4 visiting our site Call 877-603-5284 to claimyour $20 Wal-Mart Card plus $50 Gas card! Reply STOP 2Unsub or call 415-513-5459 2 Unsub now.

I did not visit their website and am on the  National DO NOT CALL list.  Assuming this is a scam.

Text message: Thx 4 visiting our site Call 877-603-5284 to claimyour $20 Wal-Mart Card plus $50 Gas card! Reply STOP 2Unsub or call 415-513-5459 2 Unsub now.
I did not visit any website and I did not call or respond to this scam. I have to pay for text messages on this type junk and I am on the National DO NOT CALL list.

I received an unsolicited text  9-7-2010 on my cell phone. The text read:  

4086676673:Thx 4 Visiting Our Site Call 877-603-5284 To Claim Your $20 Wal-Mart Card Plus $50 Gas Card! Reply STOP 2Unsub or Call 415-513-5459 2 Unsub Now

I submitted a complaint with the FCC at https://complaints.donotcall.gov/complaint/complaintcheck.aspx

I also got the same text as myqestion did and called the number.  An Indian sounding woman answered and I asked for the name of the company.  She claimed they are called "Everyday Privilege" which I immediately Google searched.  Of course, the auto-fill suggestions yielded "everyday privilege gold scam" and "everyday privilege scam."  I then asked if she knew that unsolicited calls and texts were against US Federal law and come with hefty fines.  She then went into a spiel about how I could request something or other but her accent was horribly difficult to understand.  I asked her again if she knew that these texts were against the law and she hung up on me.  The text number and info has been reported to the FCC DNC.

877.603.5287 is listed as the CB # on a text I received. No biz name was given; offered a wal-mart gift & gas gift card as well, but suggested I already signed up for something (?), & that I had to CB if I wanted to cancel.I'm afraid to CB, to give them another electronic path with them to gather more info; also afraid not to CB, as I have had to pay a month of these scams while they process cancellation.

this number was sent to us in a text message saying we won $20.00 wal-mart card and $50.00 gas card.  When I called they wanted my name, I told them I would call back later.