Phone GPS generally has little processing power on board.
Most of the work is done by the cell site using timing info
sent by the phone, so position is not really user accessible.

I looked into this at length when a local store had
refurbished 'GPS' phones on sale for $25.00. Without the cell
site processing, the GPS info simply doesn't exist.
Remember that CDMA and TDMA (GSM) need very precise timing,
so the phone just needs to report the time stamps it gets from the
GPS satellites, and need do nothing more sophisticated.

Search for "E911 GPS" for lots of links to the topic.
GPS world.com had some articles on the topic a few years ago.

Robert

Gus Salavatore Calabrese wrote:

> Is this the cheapest method for GPS tracking ?
> ( $50 )
> Are there cheaper methods ?
> 
> AGSC
> 
> See below :
> 
> GPS-Tracking Kids Cell Phone Worn Like A Wristwatch
> 
> By Personal Tech Pipeline Staff 	Personal Tech Pipeline
> 
> Hop-on, Inc. plans to launch today at CES 2006 in Las Vegas a GPS  
> tracking phone for children that kids wear like a wristwatch.
> 
> Called the Chitter Chatter phone, the device costs less than $50.
> 
> A feature called "Track-Me!" enables children to send the address of  
> their locations to their parents' cell phones via SMS with the push  
> of a button. Parents can track their children by sending an SMS  
> message to their child's phone. The parents will receive the address  
> of the child's location. The location can also be tracked over the  
> Internet.
> 
> Kids can easily contact parents using the "Mom," "Dad" and "Home"  
> speed-dial keys. Parents can also control who can call the phone and  
> whom their kids can call using seven parent-programmed numbers.
> 
> Hop-on's Chitter Chatter phone offers easy activation and set-up,  
> according to the company. Customer service will be offered online and  
> through live operators.
> 
> Hop-On Chitter Chatter Phone
> www.hop-on.com/kidsphone.html
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