[michaeleino]

Hi all,
I'm hitting my head to the walls around here!

I need to switch this USB to be used as a raw GSM modem (ie /dev/ttyxxx)

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T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#= 22 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=02(commc) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=19d2 ProdID=1024 Rev=f0.55
S:  Manufacturer=Vodafone (ZTE)
S:  Product=ZTE WCDMA Technologies MSM
S:  SerialNumber=P680A1ZTED010000
C:  #Ifs= 3 Cfg#= 1 Atr=c0 MxPwr=500mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=cdc_ether
I:  If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
I:  If#= 2 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage

the modem goes directly and create ethernet connection and no usb_modemswitch commands have any luck with me

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Look for default devices ...
   product ID matched
 Found devices in default mode (1)
Access device 022 on bus 001
Get the current device configuration ...
Current configuration number is 1
Use interface number 0
 with class 2

USB description data (for identification)
-------------------------
Manufacturer: Vodafone (ZTE)
     Product: ZTE WCDMA Technologies MSM
  Serial No.: P680A1ZTED010000
-------------------------
Warning: no switching method given. See documentation
-> Run lsusb to note any changes. Bye!

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Bus 001 Device 022: ID 19d2:1024 ZTE WCDMA Technologies MSM 

Ubuntu 16.04 LTS
usb_modeswitch 2.5.0
usb-modeswitch-data-20170205

Please help

[LOM]

I need to switch this USB to be used as a raw GSM modem (ie /dev/ttyxxx)

What you really need is to buy a device which has serial interfaces, K4201-z is a direct ethernet device and there are no serial interfaces for ppp dialup in it.
There is no other composition containing serial interfaces so what you see now is what it has got (ethernet interfaces).