It is easy to install and configure Reliance Netconnect Broadband+ Modem ZTE-AC2736 in ubuntu. Please follow the procedures

1) Install the following packages
# apt-get install wvdial usb-modeswitch
2) Plug your USB modem to your laptop

3) Edit /etc/wvdial.conf and add the following lines

#——————–
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = USB Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0

[Dialer netconnect]
Username = 93********
Password = 93********
Phone = #777
Stupid Mode = 1
Inherits = Modem0
#———————–

4) Execute the following command to start connection

# wvdial netconnect

5) Open your web browser and check some speed test.