nmcli con up id Dialog
praveen@praveen-desktop:~$ nmcli con up id Dialog
Active connection state: activating
Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/0
state: activated
Connection activated
praveen@praveen-desktop:~$
I usually open gmail with the following command
firefox gmail
praveen@praveen-desktop:~$ firefox gmail
nmcli -p dev list
praveen@praveen-desktop:~$ nmcli -p dev list
===============================================================================
Device details
===============================================================================
GENERAL.DEVICE: eth0
GENERAL.TYPE: 802-3-ethernet
GENERAL.DRIVER: 8139too
GENERAL.HWADDR: 00:16:76:79:DF:D5
GENERAL.STATE: unavailable
-------------------------------------------------------------------------------
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 10 Mb/s
-------------------------------------------------------------------------------
WIRED-PROPERTIES.CARRIER: off
-------------------------------------------------------------------------------
===============================================================================
Device details
===============================================================================
GENERAL.DEVICE: ttyUSB2
GENERAL.TYPE: gsm
GENERAL.DRIVER: option1
GENERAL.HWADDR: unknown)
GENERAL.STATE: connected
-------------------------------------------------------------------------------
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
-------------------------------------------------------------------------------
IP4-SETTINGS.ADDRESS: 123.231.47.179
IP4-SETTINGS.PREFIX: 32 (255.255.255.255)
IP4-SETTINGS.GATEWAY: 10.64.64.64
-------------------------------------------------------------------------------
IP4-DNS1.DNS: 125.214.169.88
-------------------------------------------------------------------------------
IP4-DNS2.DNS: 125.214.169.89
-------------------------------------------------------------------------------
praveen@praveen-desktop:~$