>>Well since I don't see anyone else listing this. The AT command needs either a variable before it with an equal sign or a question mark before it. It won't work without one of these.
>
>That is not true.

But then, just like any function call where you do nothing with the result, it's sort of pointless. It will work, true, but the result goes nowhere.

As for the question mark, that's right, it used to be mandatory in 2.x, and then it wasn't - don't remember since which version - except for seek function, which is interpreted as the seek command unless preceded by an equal sign.