Numbers with this prefix were first introduced in 1995.While 5105025704 was originally issued with the info above, the owner of the phone number (510) 502-5704 may have transferred it through a process called porting.
Caller type: Text/SMS
I am on the do not call list and should not have received this. This is some type of scam. "You have been selected for a $1,000 Walmart Giftcard, Enter Code: "FREE" at http://www.walmart.com.wmgc.biz to claim your prize, Act fast Supplies are limited!"