What is the meaning of tethering?
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.