Here is a short story based on common real-world scenarios users face when trying to "tame" this device. The Quest for the Region Code
client.close()
If you meant to ask how to enable Telnet on a ZTE F6640, you would typically need: telnet zte f6640
sendcmd 1 DB p MgtServer sendcmd 1 DB set MgtServer 0 URL http://127.0.0.1 sendcmd 1 DB set MgtServer 0 PeriodicInformEnable 0 sendcmd 1 DB set MgtServer 0 Tr069Enable 0 sendcmd 1 DB save Here is a short story based on common