title: How to change SIM cards and login successfully with a Blackberry ID?
body: <p>I just started to develop for BlackBerry 6 and 7 and grasped the basic for programming but when testing an example that requires to change the SIM card to validate a new number I came across a problem, I can't login.</p>
  
  <p>I'm using a SIM card provided at my workplace and I don't understand the problem. I created a BlackBerry ID and tried to login, but it gives the message "This is not a valid BlackBerry account". I can use this user to log in into their site and the device was connected to WiFi before I changed the SIM card so it should be connected to the Internet, the login screen doesn't give me an option to connect to Internet so I guess it's connected.</p>
  
  <p>I tried to change the SIM card back to its original but now it shows again a login screen.</p>
  
  <p>Does it mean that a SIM card is linked to a single BlackBerry ID? </p>
  
  <p>I'm learning from a book and nothing about changing SIM cards is covered there and the BlackBerry site is offering more on developing for BlackBerry 10 so I don't know where to dig there to find a faq section or common problems with older versions.</p>