1 We put the inputs along the horizontal axis (the $\,x\,$-axis), and the outputs along the vertical axis (the $\,y\,$-axis).  Thus, the graph of a function $\,f\,$ is a picture of all points of the form [beautiful math coming... please be patient] $\,\bigl(x, \overset{\text{y-value}}{\overbrace{ f(x)}} \bigr) \,$.
C Spire Wireless is owned by the holding company Telapex, Inc., which also owns Telepak Networks, Inc., and several smaller Mississippi telecoms. History. Cellular South, Inc. began its wireless service on the Mississippi Gulf Coast on February 4, 1988, using AMPS technology.
Simple Mobile operates a SIM-card-only service where customers bring their own GSM phones. Simple uses T-Mobile USA's network. TracFone is also an MVNO, using a mix of other national carrier's networks. TracFone is owned by America Movil, which has operations across the Americas. The deal is expected to close in the second quarter. The purchase price and other terms were not disclosed.