vwdial Bad init string on RPI

I'm trying to get a Huawei E398 3G USB modem to work on my Raspberry Pi 3 When I run wvdial I get the following response: pi@mypi:~ $ 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 ERROR --> Bad init string. This is my wvdial.conf: pi@mypi:~ $ cat /etc/wvdial.conf [Dialer Defaults] Init1 = ATZ Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 Modem Type = USB Modem ISDN = 0 New PPPD = yes Stupid Mode = yes Modem = /dev/ttyUSB0 Phone = *99# Username = internet Password = internet Baud = 115200 Anyone have any clue on what could cause this? I've tried every other init string I could come across, but every single one gives me the same error.