[Verizon Samsung Galaxy S 4] TheDude:
no, we are still working on the issue with apn selection but it doesn't matter now as verizon only uses the verizon apns (no others should be present in the apn-conf. Take a look at your apns-conf now if you haven't flashed over it. Looks like this now.

<?xml version="1.0" encoding="utf-8"?>

<!-- use empty string to specify no proxy or port -->
<!-- This version must agree with that in apps/common/res/apns.xml -->
<apns version="8">
<apn carrier="Verizon"
mcc="310"
mnc="004"
apn="internet"
type="default,mms,dun"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
/>

<apn carrier="Verizon Internet"
mcc="310"
mnc="004"
apn="VZWINTERNET"
type="default,dun"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Verizon FOTA"
mcc="310"
mnc="004"
apn="VZWADMIN"
type="fota"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Verizon IMS"
mcc="310"
mnc="004"
apn="VZWIMS"
type="ims"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Verizon CBS"
mcc="310"
mnc="004"
apn="VZWAPP"
type="cbs,mms"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>

<!-- Modify Apn database for VZW LTE support -->
<apn carrier="Verizon Internet"
mcc="311"
mnc="480"
apn="VZWINTERNET"
type="default,dun"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Verizon FOTA"
mcc="311"
mnc="480"
apn="VZWADMIN"
type="fota"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Verizon IMS"
mcc="311"
mnc="480"
apn="VZWIMS"
type="ims"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Verizon CBS"
mcc="311"
mnc="480"
apn="VZWAPP"
type="cbs,mms"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Verizon 800"
mcc="311"
mnc="480"
apn="VZW800"
type="cas"
protocol="IPV4V6"
/>
<apn carrier="VZW Roaming Internet"
mcc="204"
mnc="04"
apn="VZWINTERNET"
type="default,dun"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Roaming FOTA"
mcc="204"
mnc="04"
apn="VZWADMIN"
type="fota"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Roaming IMS"
mcc="204"
mnc="04"
apn="VZWIMS"
type="ims"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Roaming CBS"
mcc="204"
mnc="04"
apn="VZWAPP"
type="cbs,mms"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Test Internet"
mcc="001"
mnc="01"
apn="VZWINTERNET"
type="default,dun"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Test FOTA"
mcc="001"
mnc="01"
apn="VZWADMIN"
type="fota"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Test IMS"
mcc="001"
mnc="01"
apn="VZWIMS"
type="ims"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="Test CBS"
mcc="001"
mnc="01"
apn="VZWAPP"
type="cbs,mms"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test Internet"
mcc="001"
mnc="010"
apn="VZWINTERNET"
type="default,dun"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test FOTA"
mcc="001"
mnc="010"
apn="VZWADMIN"
type="fota"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test IMS"
mcc="001"
mnc="010"
apn="VZWIMS"
type="ims"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test CBS"
mcc="001"
mnc="010"
apn="VZWAPP"
type="cbs,mms"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test Internet"
mcc="246"
mnc="81"
apn="VZWINTERNET"
type="default,dun"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test FOTA"
mcc="246"
mnc="81"
apn="VZWADMIN"
type="fota"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test IMS"
mcc="246"
mnc="81"
apn="VZWIMS"
type="ims"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test CBS"
mcc="246"
mnc="81"
apn="VZWAPP"
type="cbs,mms"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test Internet"
mcc="246"
mnc="081"
apn="VZWINTERNET"
type="default,dun"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test FOTA"
mcc="246"
mnc="081"
apn="VZWADMIN"
type="fota"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test IMS"
mcc="246"
mnc="081"
apn="VZWIMS"
type="ims"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<apn carrier="VZW Test CBS"
mcc="246"
mnc="081"
apn="VZWAPP"
type="cbs,mms"
mmsc="http://mms.vtext.com/servlets/mms"
protocol="IPV4V6"
roaming_protocol="IPV4V6"
/>
<!-- END modify Apn database for VZW LTE support -->

</apns>

Now on install it detects if this is a Verizon phone, if it is it pushes the correct apns, csc, and other Verizon network related config files and changes the build.prop accordingly. Thats why the data is faster and the dialer should have less lag. We merged this from the latest official release. As for editing apns, it may be RIL related, once the official sammy 5.0 drops we can verify that.

If you dirty flashed your telephony.db will remain inaccurate and cause problems if you don't delete it. I would NOT dirty flash this build.

This is the official verizon S4 apn, it does not use mms in the type at least not for LTE.

---------- Post added at 03:29 PM ---------- Previous post was at 03:21 PM ----------

What does ro.telephony.default_network= reflect in /system/build.prop