ubuntu 16 + ec20

---

sudo apt-get install wvdial

and install

Setting up libwvstreams4.6-base (4.6.1-7) ...
Setting up libwvstreams4.6-extras (4.6.1-7) ...
Setting up libuniconf4.6 (4.6.1-7) ...
Setting up wvdial (1.61-4.1) ...

---

/etc/wvdial.conf

[Dialer Defaults]
Phone = *99#
Username = username
Password = passwd
Stupid Mode = 1
Check Def Route = on
Dial Attempts = 3
Modem = /dev/ttyUSB2
Baud = 460800
Init1 = ATZ
Init2 = ATQ0 V1 E0 S0=0 &C1 &D2 +FCLASS=0
Init3 AT+CGDCONT=1,"IP","Internet"
ISDN = 0
Modem Type = Analog Modem
APN = internet
New PPPD = yes

---

run

sudo wvdial &

--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT 150000000
--> Carrier detected.  Starting PPP immediately.
--> Starting pppd at Wed Apr  6 02:26:59 2022
--> Pid of pppd: 2460
--> Using interface ppp0
--> pppd: x[7f]
--> pppd: x[7f]
--> pppd: x[7f]
--> pppd: x[7f]
--> pppd: x[7f]
--> local  IP address 10.198.59.192
--> pppd: x[7f]
--> remote IP address 10.64.64.64
--> pppd: x[7f]
--> primary   DNS address 168.95.1.1
--> pppd: x[7f]
--> secondary DNS address 168.95.192.1
--> pppd: x[7f]

---

中華電信, apn = internet

Init3 AT+CGDCONT=1,"IP","Internet"
APN = internet

亞太電信, apn=gtnet

Init3 AT+CGDCONT=1,"IP","gtnet"
APN = gtnet

-----

mod change

> ppp_deflate            16384  0
> bsd_comp               16384  0
> ppp_async              20480  1
> option                 53248  1
> usb_wwan               20480  1 option
> qmi_wwan               32768  0
> cdc_wdm                20480  1 qmi_wwan
> usbnet                 45056  1 qmi_wwan
> mii                    16384  1 usbnet
> usbserial              45056  5 option,usb_wwan