Hi,
I would like my usb modem to be detected as modem and not sda. After connecting the device, he gets the following message:

$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 2001:a410 D-Link Corp.
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$dmesg
[ 7792.326573] usb-storage 1-1.3:1.2: USB Mass Storage device detected
[ 7792.327020] scsi host0: usb-storage 1-1.3:1.2
[ 7793.355229] scsi 0:0:0:0: Direct-Access SD Storage 0000 PQ: 0 ANSI: 2
[ 7793.356033] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 7793.367636] sd 0:0:0:0: [sda] Unit Not Ready
[ 7793.367665] sd 0:0:0:0: [sda] Sense Key : 0x5 [current]
[ 7793.367687] sd 0:0:0:0: [sda] ASC=0x20 ASCQ=0x0
[ 7793.387431] sd 0:0:0:0: [sda] Read Capacity(10) failed: Result: hostbyte=0x00 driverbyte=0x08
[ 7793.387451] sd 0:0:0:0: [sda] Sense Key : 0x5 [current]
[ 7793.387466] sd 0:0:0:0: [sda] ASC=0x20 ASCQ=0x0
[ 7793.387488] sd 0:0:0:0: [sda] 0 512-byte logical blocks: (0 B/0 B)
[ 7793.387502] sd 0:0:0:0: [sda] 0-byte physical blocks
[ 7793.387878] sd 0:0:0:0: [sda] Write Protect is off
[ 7793.387894] sd 0:0:0:0: [sda] Mode Sense: 0f 00 00 00
[ 7793.388881] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 7793.440858] sd 0:0:0:0: [sda] Unit Not Ready
[ 7793.440878] sd 0:0:0:0: [sda] Sense Key : 0x5 [current]
[ 7793.440893] sd 0:0:0:0: [sda] ASC=0x20 ASCQ=0x0
[ 7793.454856] sd 0:0:0:0: [sda] Read Capacity(10) failed: Result: hostbyte=0x00 driverbyte=0x08
[ 7793.454875] sd 0:0:0:0: [sda] Sense Key : 0x5 [current]
[ 7793.454890] sd 0:0:0:0: [sda] ASC=0x20 ASCQ=0x0
[ 7793.456849] sd 0:0:0:0: [sda] Attached SCSI removable disk

so I add lines to /etc/usb_modeswitch.conf:

DefaultVendor=0x2001
DefaultProduct=0xa410
TargetVendor=0x2001
TargetProduct=0x7e19
StandardEject=1

when I run "sudo usb_modeswitch -c /etc/usb_modeswitch.conf" and reboot system, still sees as sda and doesn't show ttyUSB, but I see that numner is changed

$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 2001:7e39 D-Link Corp.
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

What could I do?

Where does the "7e19" come from? Didn't see it anywhere in list commands. Apparently 2001:7e19 is the Vendor/Product ID for Modem D-Link DWM-221.
Googling ---> 2001:a410 didn't show anything modem related on the first page.

sorry my mistake while creating the post. In the file, "DefaultProduct = 0xa410" was set (just like in my edited post). When I wanted to do:
tar -xzvf /usr/share/usb_modeswitch/configPack.tar.gz 2001\:a410
I received an error with no package. Therefore, I found a similar device from the manufacturer in the hope that it will work. If there is no package for this modem, does it mean that it cannot be configured?

It's possible you are on the right track. I know nothing about this modem, but noticed another mistake. I'm not sure what's in the configPack.tar.gz, but the error likely came about as a result of appending the 2001:a410 which is not a tar.gz file or destination directory and thus an error was reported. Try unpacking the file without that:
It will be unpacked in /usr/share/usb_modeswitch/ unless you specify otherwise in the command