I think the problem lies somewhere else
few times ago i tried to give command with minicom (I can not do the same with cutecom, seems to repeat the input instead uutput):
Welcome to minicom 2.4
OPTIONS: I18n
Compiled on Jun 22 2010, 21:33:10.
Port /dev/ttyUSB2
Press CTRL-A Z for help on special keys
AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0
OK
AT
OK
ATZ
OK
AT+CGDCONT=1,"ip","internet.wind"
OK
ATD*99#
ERROR
Since I am not convinced, as the guide i posted, I would try to switch the modem with AT commands instead modeswtich, But the guide says to refer to "network manager" to know the name of the device to be set in minicom.
Now I ask, after i insert the usb dispositive, how I can know its device (alias /dev/tty*)?
@maro= thanks for your attention, in pdf that you are finding are apn and number, correspond to those that I already use, but it's good to have a verification, username & password is ininfluent.
For several days this part can assure that I'm doing so many tests (with ppp pppsetup umtsmon eznet/xeznet sakis wvdial...) not last the test with minicom.
Tomorrow I'll try with ubuntu to see if is a linux problem or not.