Frederick: FTFA:
"The Government does not require a member of the public to own or carry a phone," wrote U.S. Judge Edith Brown Clemen in an opinion joined by U.S. Judge Dennis Reavley. The opinion continued: "Because a cell phone user makes a choice to get a phone, to select a particular service provider, and to make a call, and because he knows that call conveys cell site information ... he voluntarily conveys his cell site data each time he makes a call."

By that logic all data available to the device -conversations, media, files, camera, contacts, etc, would be vulnerable.

Mikey1969: A key basis for the ruling: The use of cell phones is "entirely voluntarily" and therefore individuals who use them have forfeited the right to constitutional protection for records showing where they have been used, the court held.

Yeah, pretty much ANY conversation I ever have had was "entirely voluntary", does that mean that having it in private is no longer private? As others have pointed out, this broad interpretation would let them bug pretty much anything, except maybe a jail or a courtroom, and I guess even a courtroom could be bugged, since you could always kill yourself to avoid going into court, therefore, it would be "voluntary", since you chose not to kill yourself. Same with jail, I guess. How can a conversation with your lawyer(Or your doctor on the outside) be confidential, since you "voluntarily" went to this meeting?

Flargan: "Because a cell phone user makes a choice to get a phone, to select a particular service provider, and to make a call, and because he knows that call conveys cell site information ... he voluntarily conveys his cell site data each time he makes a call."
-FTA

Doesn't this go against the Telecommunications Act of 1996?

Flargan: way south: /I'm curious: Where do they think the 4th amendment actually applies?

I think the right question is "Who do they think the 4th amendment applies to?"

Flargan: Deneb81: In what way?

In general your information is supposed to be protected by the telcom. 
Section 222
(a)(1) In general Every telecommunications carrier has a duty to protect the confidentiality of proprietary information of, and relating to, other telecommunication carriers, equipment manufacturers, and customers, including telecommunication carriers reselling telecommunications services provided by a telecommunications carrier.
(c)(1) :  Privacy requirements for telecommunications carriers
Except as required by law or with the approval of the customer, a telecommunications carrier that receives or obtains customer proprietary network information by virtue of its provision of a telecommunications service shall only use, disclose, or permit access to individually identifiable customer proprietary network information in its provision of (A) the telecommunications service from which such information is derived, or (B) services necessary to, or used in, the provision of such telecommunications service, including the publishing of directories.I am no legal scholar so there is a good possibility I am wrong.
I just find it hard to believe that this ruling doesn't run counter to a myriad of different laws.

Headso: Deneb81: Question: why do you think you have a 4th amendment claim over records a third party keeps in the regular course of business as a necessary part of providing a service you signed up for?

So, any private residence with stored security camera footage should also be free to access without a warrant, and private records you have on offsite backup? Just because a third party is involved shouldn't mean the government should just be allowed to go through your stuff.

Mikey1969: Bendal: What if you use your phone only in the privacy of your home? Is the data still not covered under the 4th Amendment?

You aren't getting it... You HAVE no privacy "in your own home", since that situation is totally voluntary. Using this logic, they could follow you and listen anywhere, except when the government actively forces you to be there, and if you got up and walked in a room by yourself, I'm sure that could be seen as "voluntary", and anything you do wouldn't be private.