Download APN shortcut from Play Store,
If not already, create APN and enter the following then save leave all other fields left as is.
View Image cant post the settings XDA spam filters are set on extreme and looking at the settings as links oh well
Need others to test this, YES im using cingular as my MMS server settings, and YES im using the STOCK messenger to send/receive MMS/Group Messages. This will also get 4g working ( data ) working on your LG G2 LS980