Cell phone GPS and E911

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My employer has gone with Altell (sp?) and probably cheapest phone.
[It is a custom labeled unit. No idea who makes it. I have already discovered manual was not proofread. EG it states that to answer an incoming call you press "Send".
*NO NO _NO NO NO_ NO* !!!!!!!!!!!!!!!!!
You just open it :<

A PBS broadcast claimed that ~100% of current production cell phones were GPS equipped. The MAJOR point of story was that few providers allowed any simple access to GPS determined location.

It did, however, make the point that there was GPS capability as response to *Federal* requirement that cell phones could report location to emergency services. It also reported reasoning of manufactures/providers for not making the information too easily accessible. Politically correct reason was "privacy" LOL. The significant reason was economic -- they wanted to provide it as an added "feature".

The inane manual gives subject short shrift.
User has only two options.
911 access only
Publicly available
/* *END* LONG WINDED PREFACE

Now to my question.
For work, I drive *RURAL* roads between Springfield, MO and Little Rock, AR on "graveyard shift".

In some areas it is appropriate to dial 911 [LOCAL emergency dispatch].
In other areas one should dial *55 [Highway Patrol / State Police]

How would phone decide whether or not to reveal your location?
Does it reveal same if *AND only if* you dialed digits "911"?
Does it reveal same if answering system provides appropriate key?
If other???????????????????



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