As found here, you must replace every occurrence of archive.raspberrypi.org or mirrordirector.raspbian.org by legacy.raspbian.org, which is an official site.

Source: software installation – Why doesn’t Raspbian apt-get resolve package version correctly? – Unix & Linux Stack Exchange

Source: ADSLPPPoE – Community Help Wiki

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
ISDN = 0
Modem = /dev/ttyUSB2
Baud = 9600

[Dialer thenet]
Phone = *99***1#
Username = thenetuser
Password = thenetpw
; Username = 9180****** (If your provider use without Username)
; Password = 9180****** (If your provider use without Password)
Stupid Mode = 1
Baud = 460800
Init3 = AT+CGDCONT=1,"IP","apn.thenet.net"

[Dialer mypin]
Init4 = AT+CPIN=1234

Source: Wvdial – ArchWiki

Create the wvdial config file

• The next step is to create a config file for wvdial so you can connect to your service provider.
• Open a terminal window and enter:

sudo leafpad /etc/wvdial.conf

• Replace the content of the file with the following.

[Dialer 3gconnect]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = AT+CGDCONT=1,"IP","internet"
Stupid Mode = 1
Modem Type = Analog Modem
ISDN = 0
Phone = *99#
Modem = /dev/gsmmodem
Username = { }
Password = { }
Baud = 460800

• Replace internet with your service provider’s APN
• Replace the Phone number if you need to dial a different code to connect.
• Replace Username and Password if needed. To leave the username and password as blank use { }

Source: How to setup a USB 3G Modem on Raspberry PI using usb_modeswitch and wvdial | How To | The Fan Club | dynamic design solutions

Source: “AT command” in the Huawei e3372h-510,i need help 🙁 – Huawei Enterprise Support Community