If the "child find" feature is activated,
or you obtain other software, yes.
VoIP phones differ from cell phones primarily in that they connect through the internet, rather than via a cell signal. Therefore they do not require any additional phone plan as all the data is covered by your internet plan.
Track my shares?
It depends on your cell phone. Some phones have an internet tethering option when connected to your computer via Bluetooth or USB.
You could probably download a free texting app, and connect to the internet via wifi (to allow the app to function).
GPS is built into all cell phones now as part of the 911 emergency system. However, it's possible that not all cell phones actually allow the user to use it. Essentially all cell phones that are considered "smart" will have GPS functionality for the user. Cell phones like the iPhones even allow you to view it's location on a remote computer via it's Find My iPhone feature.
It's done with trilateration. Read more here http://hubpages.com/hub/How-Does-GPS-Work-In-Cell-Phones
SMS service stands for Simple Message System. This allows you to send messages to other people Via their cell phones There are lists of all the cell phone providers that you can look up on the internet.
One can purchase refurbished Sprint cell phones via eBay and Amazon. One can also visit the official Sprint website and view their Preowned page to find specific phones.
In the context of cell phones, tethering is connecting your phone to a laptop or similar data device using a data cable, usually for the purpose of connecting to the Internet on the laptop, via the phone's wireless connection to the cell phone network. Carriers usually charge more money for accessing the Internet via tethering, as opposed to on the phone itself. Sometimes this is enforced via technology in the phone, although often it is simply the honor system and not strictly enforced.
Polycom phones are VoIP phones that are used to make calls via the internet. These Polycom phones can be purchased at stores such as Best Buy, Office Depot, as well as on Amazon and EBay.
Keyboard, Mouse, Scanner, Cell Phones (via USB), etc.
i use gmail, which you can send text to cell phnes