Try these APN settings. MMS works for sending, but not incoming.
Here are the settings for your Sprint:
Go to
Wireless & Network>Mobile Networks> Access Point Names (APN) select it or if is not there make a new one with these settings
settings: APN
Name:
internet
APN: Android
Proxy:<Not set>
Port:<Not set>
Username:<Not set>
Password:<Not set>
Server:<Not set>
MMSC:
http://63.215.195.152/servlets/mms?X-SPRINT-MDN=(10 didgit
phone number)
MMS proxy:<Not set>
MMS Port: 80
MMC:310
MNC:995
Authentication Type:<Not set>
APN type:<Not set>