ksmithaz1: I signed up for this forum for issues with this very modem, lord knows I searched high and low on the web...
I'm running stretch instead of buster. I REALLY wanted to use smsd. I actually downloaded the source and re-compiled with all the debugging turned on. I could not get the darn thing to send a text. Running direct against the modem (I use ckermit) I found I could not send a message until I sent +CGSMS=2. I ended up writing a script to send sms via the device, and try as I might I could not receive a message. I have the PDF for the U620L command set. I tried most everything. Anyone else had any luck. I *know* you can do it, because the VZ software will do it on Windows.
. . .
[GSM1]
init = ATE0+CPMS="SM","SM","SM"+CGSMS=2
device = /dev/ttyUSB0
baudrate = 9600
incoming = yes
check_memory_method = 2
check_network = 0
memory_start = 0
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