I read those messages. The ones from one of my banks that uses SMS and differentiates them, says "your code to do BLAH is BLAH". I was actually saved from phishing once because my credit card company included the vendor and the amount in the transaction SMS and it was for a different site and a much larger amount than what I thought I was spending.
I for one don't ever read those messages, and Android at least will usually copy the code for you making them even easier to ignore.