I want to send an AT command with my iPhone application, but I do not know how to do this. I know that the AT command can use for blockSMS, sendSMS, etc. Any help?
If the iPhone is unlocked, you can download a program called minicom to talk directly through the port. Here is a link to help you: http://www.letsunlockiphone.com/install-minicom-iphone-4-baseband/
This will show you which ports should talk in your application in order to send At commands.
Good luck