The invention discloses a push-to-talk (PTT) voice
system mobile phone terminal, a communication
service system and a communication service method thereof. The
mobile phone terminal comprises a
signal indicator light, a power supply indicator light, an earphone, a
microphone and a charging interface; a panel is provided with a short message read key, a dialing key, a hang off key, an emergency call key and an artificial service key; and the left side of a
mobile phone is provided with a volume increase key and a volume decrease key, and the right side thereof is provided with a time telling key, a
headset socket and a keyboard locking key. The communication
service system consists of a
software system and a hardware
system, wherein
software is formed by three levels, and hardware is formed by mutually connecting an external network, a firewall, a manual
desk, a calling platform, a first exchange
machine, a communication network, a fixed-line telephone, the mobile phone, a second exchange
machine, a signaling gateway, a first
server, a third exchange
machine, a second
server, a
web server, a short message gateway, a business
application server and a fourth exchange machine. Therefore, the invention has the advantages of loud ring tone, large keys, loud conversation sound, small volume and long standby time, thus being widely applied to old people.