1. Locate your APN
    • Tap ‘Settings’
    • Tap ‘More’
    • Tap ‘Mobile Networks’
    • Tap ‘Access Point Names’
    • Tap ‘New APN setting (or + sign)’Tap ‘More’
  1. Set up your APN
    • Name: PM
    • APN: sp.mb.com
    • Proxy: Leave blank
    • Port: Leave blank
    • Username: Leave blank
    • Password: Leave blank
    • Server: Leave blank
    • MMSC: http://aliasredirect.net/proxy/mb/mmsc
    • MMSC proxy: 74.49.0.18
    • MMS port: 80
    • MCC: 302
    • MNC: 220
    • Authentication type: Leave blank
    • APN type: Leave blank

Note: when you put in 74.49.0.18, I suggest you include 80 like this 74.49.0.18:80. I have found doing this on every flip phone I have had that this always works (combining MMSC proxy with port).

 

You can take a look here, this is a document I made for some of my own flip phones and some carriers I've gotten to work on them.

https://1drv.ms/w/s!Anqn_P8B_fS6hQCbO_-ZKjoU-4WJ