i forgot somethin
in some cases the modem must be in modem mode the easy way to set it is using at commands and set at^u2diag=0 but in some modems that command didnt work...
some need to be access via hilink webpage 192.168.1.1\html\switchprojectmode.html and then use at^u2diag=0
other modems need a AT^SETPORT="A1,A2;1,2,3" and others like e3131 and e367 need AT^SETPORT="FF;1,2" to be set as modem mode only, and after that the esxi can use them :)