Troubleshooting and Understanding MMS

[treebeard]

Another interesting fun fact:  I added an APN in gnome settings named Verizon, but left the actual APN name entirely blank.  I was able to use mobile data normally.  However, I still was not able to use MMS in Chatty with the APN set to vzwapp.

Check the log/journal where mmsdtng is initializing.  A snippet of mine:

Code:

mmsdtng[889]: ../plugins/modemmanager.c:set_context() Setting Context...
mmsdtng[889]: ../src/service.c:mms_service_set_mmsc() service 0x55880a3e70 mmsc http://mms.vtext.com/servlets/mms
mmsdtng[889]: ../plugins/modemmanager.c:set_context() Max number of bearers: 1
mmsdtng[889]: ../plugins/modemmanager.c:set_context() Current Context APN: vzwapp, mmsd-tng settings MMS APN: vzwapp
mmsdtng[889]: ../plugins/modemmanager.c:set_context() You are connected to the correct APN! Enabling context...
mmsdtng[889]: ../src/service.c:mms_service_set_apn() Service APN Set to vzwapp
mmsdtng[889]: ../src/service.c:mms_service_set_resolvers() service 0x55880a3e70 resolvers: ipv4: 198.224.177.135,198.224.176.135, ipv6: 2001:4888:45:ff00:432:d::,2001:4888:46:ff00:430:d::
mmsdtng[889]: ../plugins/modemmanager.c:set_context() DNS from modemmanager IPv6: 2001:4888:45:ff00:432:d::,2001:4888:46:ff00:430:d::, IPv4: 198.224.177.135,198.224.176.135
mmsdtng[889]: ../plugins/modemmanager.c:set_context() Current Context APN: vzwinternet, mmsd-tng settings MMS APN: vzwapp
mmsdtng[889]: ../plugins/modemmanager.c:set_context() Current Context APN: vzwinternet, mmsd-tng settings MMS APN: vzwapp
mmsdtng[889]: ../plugins/modemmanager.c:bearer_handler() At Bearer Handler: path /org/freedesktop/ModemManager1/Modem/0 active 0 context_active 1
mmsdtng[889]: ../plugins/modemmanager.c:bearer_handler() checking for failure
mmsdtng[889]: ../plugins/modemmanager.c:bearer_handler() No failures
mmsdtng[889]: ../src/service.c:mms_service_bearer_notify() service=0x55880a3e70 active=0 iface=wwan0 proxy=(null)

Look especially for that "You are connected to the correct APN! Enabling context..."