[Sprint LG Optimus G] octhrope:
Are you using a 3rd party app for sms/mms? The Sprint APNs are stock in the file you sent me.

<!-- Sprint -->
<!-- Sprint CDMA MMS: Use LTE/eHRPD mms apns to avoid LTE/eHRPD service conflicts. -->
<!--<apn carrier="Sprint" mcc="310" mnc="120" apn="Sprint" user="Sprint" server="*" password="*" mmsc="http://mms.sprintpcs.com" authtype="3"/>-->

<!-- Modify Apn database for Sprint LTE support -->
<apn carrier="LTE - SPRINT test ISP" mcc="001" mnc="01" apn="n.ispsn" type="default,mms" mmsc="http://mms.sprintpcs.com" mmsproxy="68.28.31.7" mmsport="80" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<apn carrier="LTE - SPRINT test OTA" mcc="001" mnc="01" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<apn carrier="LTE - SPRINT test PAM" mcc="001" mnc="01" apn="pamsn" type="dun" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<apn carrier="LTE - SPRINT test ISP" mcc="001" mnc="010" apn="n.ispsn" type="default,mms" mmsc="http://mms.sprintpcs.com" mmsproxy="68.28.31.7" mmsport="80" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<apn carrier="LTE - SPRINT test OTA" mcc="001" mnc="010" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<apn carrier="LTE - SPRINT test PAM" mcc="001" mnc="010" apn="pamsn" type="dun" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<!-- END modify Apn database for Sprint LTE support -->

<!-- Modify Apn database for Sprint EHRPD support -->
<apn carrier="EHRPD - SPRINT test ISP" mcc="001" mnc="01" apn="n.ispsn" type="default,mms" mmsc="http://mms.sprintpcs.com" mmsproxy="68.28.31.7" mmsport="80" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<apn carrier="EHRPD - SPRINT test OTA" mcc="001" mnc="01" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<apn carrier="EHRPD - SPRINT test PAM" mcc="001" mnc="01" apn="pamsn" type="dun" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<apn carrier="EHRPD - SPRINT test ISP" mcc="001" mnc="010" apn="n.ispsn" type="default,mms" mmsc="http://mms.sprintpcs.com" mmsproxy="68.28.31.7" mmsport="80" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<apn carrier="EHRPD - SPRINT test OTA" mcc="001" mnc="010" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<apn carrier="EHRPD - SPRINT test PAM" mcc="001" mnc="010" apn="pamsn" type="dun" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<!-- END modify Apn database for Sprint EHRPD support -->

<!-- Sprint LTE/eHRPD: These apns are added then programmatically removed in S3 LG8 build. -->
<!--<apn carrier="LTE - SPRINT OTA" mcc="310" mnc="120" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />-->
<!--<apn carrier="EHRPD - SPRINT OTA" mcc="310" mnc="120" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />-->

<!-- Sprint LTE/eHRPD: Programmatically added in S3 LG8 build. -->
<apn carrier="APN0 LTE ota" mcc="310" mnc="120" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<apn carrier="APN0 EHRPD ota" mcc="310" mnc="120" apn="otasn" type="fota" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<apn carrier="APN2 LTE internet" mcc="310" mnc="120" apn="n.ispsn" type="default,mms" mmsc="http://mms.sprintpcs.com" mmsproxy="68.28.31.7" mmsport="80" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="14" />
<apn carrier="APN2 EHRPD internet" mcc="310" mnc="120" apn="n.ispsn" type="default,mms" mmsc="http://mms.sprintpcs.com" mmsproxy="68.28.31.7" mmsport="80" protocol="IPV4V6" roaming_protocol="IPV4V6" bearer="13" />
<!-- END Sprint -->