[Galaxy S III I9305 (4G LTE + 2GB RAM) Q&A, Help & ] erosco:
Update

Seems I can't contact the Proxy when on any LTE APN. If I'm on wifi (last entry) the HTTP connection goes through.. something is really really screwy.. Can't imagine why optus would block access to their own MMS proxy?!

11-26 17:49:36.247 I/SystemServiceManager(2391): Starting com.android.server.MmsServiceBroker

11-26 17:49:38.667 I/MmsServiceBroker(2391): Delay connecting to MmsService until an API is called

11-26 17:50:31.637 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:50:31.637 W/MmsServiceBroker(2391): MmsService not connected. Try connecting...

11-26 17:50:31.637 I/MmsServiceBroker(2391): Connecting to MmsService

11-26 17:50:31.638 W/ContextImpl(2391): Calling a method in the system process without a qualified user: android.app.ContextImpl.bindService:1421 com.android.server.MmsServiceBroker.tryConnecting:240 com.android.server.MmsServiceBroker.-wrap3:-1 com.android.server.MmsServiceBroker$1.handleMessage:82 android.os.Handler.dispatchMessage:102

11-26 17:50:31.763 I/MmsServiceBroker(2391): MmsService connected

11-26 17:50:31.874 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:50:31.928 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:50:46.810 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.google.android.apps.messaging

11-26 17:50:46.862 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.google.android.apps.messaging

11-26 17:50:46.999 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.google.android.apps.messaging

11-26 17:50:59.870 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:50:59.910 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:51:00.015 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:52:43.039 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.google.android.apps.messaging

11-26 17:52:43.656 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.google.android.apps.messaging

11-26 17:52:43.836 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.google.android.apps.messaging

11-26 17:53:01.428 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:53:01.472 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:53:01.522 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.android.messaging

11-26 17:53:01.952 D/MmsServiceBroker(2391): getCarrierConfigValues() by com.google.android.apps.messaging

11-26 17:53:01.970 D/MmsServiceBroker(2391): sendMessage() by com.google.android.apps.messaging

11-26 17:53:24.024 D/MmsServiceBroker(2391): sendMessage() by com.google.android.apps.messaging

11-26 17:54:31.568 D/MmsService(2876): [SendRequest@a25269d] MmsNetworkManager: start new network request

11-26 17:54:32.176 I/MmsService(2876): NetworkCallbackListener.onAvailable: network=112

11-26 17:54:32.184 D/MmsService(2876): [SendRequest@a25269d] APN name is mms

11-26 17:54:32.184 I/MmsService(2876): [SendRequest@a25269d] Loading APN using name mms

11-26 17:54:32.189 I/MmsService(2876): [SendRequest@a25269d] Using APN [type=mms mmsc=http://mmsc.optus.com.au:8002/ mmsproxy=61.88.190.10 mmsport=8070 name=Optus MMS apn=mms bearer_bitmask=0 protocol=IP roaming_protocol=IP authtype=1]

11-26 17:54:32.194 D/MmsService(2876): [SendRequest@a25269d] HTTP: POST http://mmsc.optus.com.au[30], proxy=61.88.190.10:8070, PDU size=28820

11-26 17:54:32.196 I/MmsService(2876): [SendRequest@a25269d] HTTP: User-Agent=CyanogenMod

11-26 17:54:32.196 I/MmsService(2876): [SendRequest@a25269d] HTTP: UaProfUrl=http://www.google.com/oha/rdf/ua-profile-kila.xml

11-26 17:54:32.200 E/MmsService(2876): [SendRequest@a25269d] HTTP: IO failure

11-26 17:54:32.200 E/MmsService(2876): java.net.ConnectException: Network is unreachable

11-26 17:54:32.200 E/MmsService(2876):	at java.net.PlainSocketImpl.socketConnect(Native Method)

11-26 17:54:32.200 E/MmsService(2876):	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:334)

11-26 17:54:32.200 E/MmsService(2876):	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)

11-26 17:54:32.200 E/MmsService(2876):	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)

11-26 17:54:32.200 E/MmsService(2876):	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)

11-26 17:54:32.200 E/MmsService(2876):	at java.net.Socket.connect(Socket.java:586)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.internal.Platform.connectSocket(Platform.java:113)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.Connection.connectSocket(Connection.java:196)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.Connection.connect(Connection.java:172)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:367)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:130)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:247)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:457)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:126)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:257)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.mms.service.MmsHttpClient.execute(MmsHttpClient.java:183)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.mms.service.SendRequest.doHttp(SendRequest.java:83)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.mms.service.MmsRequest.execute(MmsRequest.java:171)

11-26 17:54:32.200 E/MmsService(2876):	at com.android.mms.service.MmsService$2.run(MmsService.java:414)

11-26 17:54:32.200 E/MmsService(2876):	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)

11-26 17:54:32.200 E/MmsService(2876):	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)

11-26 17:54:32.200 E/MmsService(2876):	at java.lang.Thread.run(Thread.java:761)

11-26 17:54:32.200 D/MmsService(2876): [SendRequest@a25269d] MmsNetworkManager: release, count=0

11-26 17:54:32.205 E/MmsService(2876): [SendRequest@a25269d] HTTP or network I/O failure

11-26 17:54:32.205 E/MmsService(2876): com.android.mms.service.exception.MmsHttpException: java.net.ConnectException: Network is unreachable

11-26 17:54:32.205 E/MmsService(2876):	at com.android.mms.service.MmsHttpClient.execute(MmsHttpClient.java:225)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.mms.service.SendRequest.doHttp(SendRequest.java:83)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.mms.service.MmsRequest.execute(MmsRequest.java:171)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.mms.service.MmsService$2.run(MmsService.java:414)

11-26 17:54:32.205 E/MmsService(2876):	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)

11-26 17:54:32.205 E/MmsService(2876):	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)

11-26 17:54:32.205 E/MmsService(2876):	at java.lang.Thread.run(Thread.java:761)

11-26 17:54:32.205 E/MmsService(2876): Caused by: java.net.ConnectException: Network is unreachable

11-26 17:54:32.205 E/MmsService(2876):	at java.net.PlainSocketImpl.socketConnect(Native Method)

11-26 17:54:32.205 E/MmsService(2876):	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:334)

11-26 17:54:32.205 E/MmsService(2876):	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)

11-26 17:54:32.205 E/MmsService(2876):	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)

11-26 17:54:32.205 E/MmsService(2876):	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)

11-26 17:54:32.205 E/MmsService(2876):	at java.net.Socket.connect(Socket.java:586)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.internal.Platform.connectSocket(Platform.java:113)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.Connection.connectSocket(Connection.java:196)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.Connection.connect(Connection.java:172)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:367)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:130)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:247)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:457)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:126)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:257)

11-26 17:54:32.205 E/MmsService(2876):	at com.android.mms.service.MmsHttpClient.execute(MmsHttpClient.java:183)

11-26 17:54:32.205 E/MmsService(2876):	... 6 more

11-26 17:54:36.205 D/MmsService(2876): [SendRequest@a25269d] MmsNetworkManager: start new network request

11-26 17:54:36.889 I/MmsService(2876): NetworkCallbackListener.onAvailable: network=113

11-26 17:54:36.897 D/MmsService(2876): [SendRequest@a25269d] APN name is mms

11-26 17:54:36.897 I/MmsService(2876): [SendRequest@a25269d] Loading APN using name mms

11-26 17:54:36.902 I/MmsService(2876): [SendRequest@a25269d] Using APN [type=mms mmsc=http://mmsc.optus.com.au:8002/ mmsproxy=61.88.190.10 mmsport=8070 name=Optus MMS apn=mms bearer_bitmask=0 protocol=IP roaming_protocol=IP authtype=1]

11-26 17:54:36.906 D/MmsService(2876): [SendRequest@a25269d] HTTP: POST http://mmsc.optus.com.au[30], proxy=61.88.190.10:8070, PDU size=28820

11-26 17:54:36.907 I/MmsService(2876): [SendRequest@a25269d] HTTP: User-Agent=CyanogenMod

11-26 17:54:36.907 I/MmsService(2876): [SendRequest@a25269d] HTTP: UaProfUrl=http://www.google.com/oha/rdf/ua-profile-kila.xml

11-26 17:54:37.340 D/MmsService(2876): [SendRequest@a25269d] HTTP: 200 OK

11-26 17:54:37.340 D/MmsService(2876): [SendRequest@a25269d] HTTP: response size=67

11-26 17:54:37.340 D/MmsService(2876): [SendRequest@a25269d] MmsNetworkManager: release, count=0

11-26 17:54:37.342 D/MmsService(2876): getAutoPersisting

11-26 17:54:37.358 D/MmsService(2876): Schedule requests pending on SIM