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The format of Basic Syntax commands (except for the D and S commands) is: 
<command>[<number>]

where:

<command> is either a single character, or the "&" character (IA5 2/6) followed by a single 
character. 
Characters used in <command> are taken from the set of alphabetic characters.

<number> may be a string of one or more characters from "0" through "9" representing a 
decimal integer value.

Commands that begin with the letter S constitute a special group of parameters known as 
"S-parameters". These differ from other commands in important respects:

The number following the S indicates the "parameter number" being referenced. If the 
number is not recognized as a valid parameter number, an ERROR result code is issued. 

Immediately following this number, either a "?" or "=" character (IA5 3/15 or 3/13, 
respectively) appears:

"?" is used to read the current value of the indicated S-parameter. 

"=" is used to set the S-parameter to a new value. "<parameter_number>"
"<parameter_number" =[<value>]

If the "=" is used, the new value to be stored in the S-parameter is specified in decimal form 
following the "=".

Both actions and parameters have names, which are used in the related commands. Names always 
begin with the character "+" (IA5 2/11). Following the "+", from one to sixteen (16) additional 
characters appear in the command name. 

All (GSM) cellular commands have the prefix "+C".

All Fax commands have the prefix "+F".

All General modem commands have the prefix "+G".

Most Motorola propriety commands have the prefix "+M".