The green mark on the Apple mobile phone is the switch for cellular data. When turned off, the traffic of the number card will be stopped.

The meaning of the Apple logo picture is an apple bitten by God, and Apple's philosophy is that only imperfection can promote progress and pursue perfection.

Apple Computer uses the bitten apple as its trademark to commemorate Alan Turing, the great pioneer in the field of artificial intelligence.

Network technology characteristics:

(1) It is currently the internationally recognized best wireless public network data communication protocol.

(2) It adopts packet switching mode, with high information utilization rate and low network cost. It is an open system structure based on TCP/IP protocol.

(3) Strong confidentiality and reliability, with air link encryption, dynamic key management (RC4), compression, data error detection, error correction, retransmission and other functions, with extremely low bit error rate .

(4) It has handover and network-wide roaming, broadcast and group call functions.