Data not working and 300 MG left

[Morgan20]

My data was working great but I still have 300 mg left and not working anymore?

[mimmo]

Do you have a max data limit that is stopping data usage on your phone?

[Psygineer]

Did you recently factory reset your phone or switch phones? Some phones seem to work with the data out of the box. Others require you to manually configure it. I don't know what kind of phone you have, but you can find this in the settings (APN). Check to see if your settings match what is below.

Name: Public Mobile
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 

[Dunkman]

@Morgan20

What does your account status show?  Active or suspended.  Does it show My data and add on section?  

Maybe try re-booting your phone...