Here it is:
Dear client Att Mobility Llc, congratulations!
We would like to thank you for your loyalty to Att Mobility Llc, and thus we offer you an exclusive change to get a Walmart $1000 Gift Card today -. All you ahve to do is choose the correct gift box to get started. Good luck!
Basically, the message is different from mobile devices based on the Wireless or Cellular network you are connected to. So, it could say "Dear client Verizon" or "Dear Client Comcast" etc. This is a SCAM! Just close it.