Sim not provisioned mm#2 error message on my new Infuse

All:

  I just received my new Samsung Infuse 4G from Amazon this morning. I have installed the Sim card and battery; and, am successfully charging it.  I have activated my phone; so, it should be ready in the next day or so. 

  Whenever I have attempted to contect to my pop3 server via my pop.yahoo.att.com server, it gives me a "cannot connect to a server".  Is it to do with the this Sim error message? 

Keith