its a junk text. You've done very well not to have received one before though - I get them on my pay as you go mobile that I only use when in the UK - maybe 2 months of the year.
Hope you didn't get too excited...
PS it may not be a total scam though - sometimes they are timeshare companies who will give you a prize, but will make you sit through a 2 hour "ceremony" of hard sell before you get it.