Hi 7rots51,
I have exstansive experiance with mobile phones, So i can safly say this word:
Most modems will have only a turn off command. For example the Sony Ericson will use AT+CFUN=0. Each company will have almost its own code for non standerd commands. A turn off command is a non standerd command.
For turning on, I never saw a command. Mainly because the internal proccesor is off, and thus the uart will not function.
Some phones will turn on, if you will connect one or few of the pines togather. you will have to find out more on the internet if it is possible. Most modems will have a pin to turn on/off or will turn automatcly when you apply power.
To find out the exact command in FBUS, go to the gnokii web site.
Also, try this link. maye it will help you to nero your search:
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Also check out this one:
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Good luck.