The old Sprint CDMA MMS apn uses the same MCC/MNC pair (310120) and apn
type ("default") as Sprint's LTE/eHRPD service. Thus, Sprint LTE devices
attempt to connect to LTE/eHRPD services using the old CDMA MMS apn first,
which usually fails, and thus delays service establishment.
However, occasionally service "successfully" connects with the CDMA MMS
apn, for unknown reasons, at which point that apn is set as the preferred
apn for LTE connections. Thus, any subsequent LTE/eHRPD connection attempt
fails due to use of the wrong apn.
By removing the old CDMA MMS apn, LTE/eHRPD connections will use the
appropriate apns. Furthermore
com.android.mms.transaction.TransactionSettings::TransactionSettings does
not query the bearer field when looking for valid MMS apns, so the
LTE/eHRPD will continue to work on non-LTE Sprint devices.
Note that with this change, the MMS apn now specifies an mmsproxy.
Change-Id: Iba48bd6d120b02bc6265f958d0e04181d17f5c66
c1d27debdc