After IPCP sent from modem, I never get a response from the network and then the modem hangs up and is stuck in data mode until I hard reset it.
OS is Ubuntu 20.04, with ModemManager service turned off for now.
The SIM card is the one that comes with the XBee3 from Digi, if that helps.
Any ideas as to why I am getting the hang up? How can I ensure that the modem is in command mode, or ensure the modem is reset properly after I get the hang up?