[Samsung Galaxy J3 (2016) ROMs, Kernels, Recoveries] djeman:
I think it's not easy to fix mms ...

08-04 12:29:28.654 D/MmsServiceBroker(1253): getCarrierConfigValues() by com.google.android.apps.messaging
08-04 12:29:28.654 D/MmsService(2120): getCarrierConfigValues
08-04 12:29:28.655 I/MmsService(2120): mms config for sub 1: Bundle[{httpSocketTimeout=60000, aliasMinChars=2, smsToMmsTextThreshold=-1, enableSMSDeliveryReports=true, maxMessageTextSize=-1, supportMmsContentDisposition=true, enabledTransID=false, aliasEnabled=false, supportHttpCharsetHeader=false, allowAttachAudio=true, smsToMmsTextLengthThreshold=-1, recipientLimit=2147483647, uaProfTagName=x-wap-profile, aliasMaxChars=48, maxImageHeight=1944, enableMMSDeliveryReports=false, userAgent=, config_cellBroadcastAppLinks=true, maxSubjectLength=40, httpParams=, enableGroupMms=true, emailGatewayNumber=, maxMessageSize=614400, naiSuffix=, enableMMSReadReports=false, maxImageWidth=2592, uaProfUrl=, enabledMMS=true, enabledNotifyWapMMSC=false, sendMultipartSmsAsSeparateMessages=false, enableMultipartSMS=true}]
08-04 12:29:28.695 D/MmsServiceBroker(1253): sendMessage() by com.google.android.apps.messaging
08-04 12:29:28.706 D/MmsService(2120): sendMessage
08-04 12:29:28.713 D/MmsService(2120): Current running=0, current subId=-1, pending=0
08-04 12:29:28.713 D/MmsService(2120): Add request to running queue for subId 1
08-04 12:29:28.718 I/MmsService(2120): [SendRequest@ce78918] Executing...
08-04 12:29:28.718 I/MmsService(2120): mms config for sub 1: Bundle[{httpSocketTimeout=60000, aliasMinChars=2, smsToMmsTextThreshold=-1, enableSMSDeliveryReports=true, maxMessageTextSize=-1, supportMmsContentDisposition=true, enabledTransID=false, aliasEnabled=false, supportHttpCharsetHeader=false, allowAttachAudio=true, smsToMmsTextLengthThreshold=-1, recipientLimit=2147483647, uaProfTagName=x-wap-profile, aliasMaxChars=48, maxImageHeight=1944, enableMMSDeliveryReports=false, userAgent=, config_cellBroadcastAppLinks=true, maxSubjectLength=40, httpParams=, enableGroupMms=true, emailGatewayNumber=, maxMessageSize=614400, naiSuffix=, enableMMSReadReports=false, maxImageWidth=2592, uaProfUrl=, enabledMMS=true, enabledNotifyWapMMSC=false, sendMultipartSmsAsSeparateMessages=false, enableMultipartSMS=true}]
08-04 12:29:28.733 D/MmsService(2120): [SendRequest@ce78918] MmsNetworkManager: start new network request
08-04 12:29:28.740 I/MmsService(2120): NetworkCallbackListener.onAvailable: network=101
08-04 12:29:28.742 D/MmsService(2120): [SendRequest@ce78918] APN name is fnetnrj
08-04 12:29:28.742 I/MmsService(2120): [SendRequest@ce78918] Loading APN using name fnetnrj
08-04 12:29:28.751 I/MmsService(2120): [SendRequest@ce78918] No match with APN name: fnetnrj, try with no name
08-04 12:29:28.751 I/MmsService(2120): [SendRequest@ce78918] Loading APN using name null
08-04 12:29:28.759 I/MmsService(2120): [SendRequest@ce78918] Using APN [type=mms mmsc=http://mmsnrj mmsproxy=10.143.156.5 mmsport=8080 name=NRJ MMS apn=mmsnrj bearer_bitmask=0 protocol=IP roaming_protocol=IP authtype=-1]
08-04 12:29:28.760 D/MmsService(2120): [SendRequest@ce78918] HTTP: POST [url]http://mmsnrj[/url][13], proxy=10.143.156.5:8080, PDU size=107850
08-04 12:29:28.765 I/MmsService(2120): [SendRequest@ce78918] HTTP: User-Agent=LineageOS
08-04 12:29:28.765 I/MmsService(2120): [SendRequest@ce78918] HTTP: UaProfUrl=http://www.google.com/oha/rdf/ua-profile-kila.xml
08-04 12:30:03.849 E/MmsService(2120): [SendRequest@ce78918] HTTP: IO failure
08-04 12:30:03.849 E/MmsService(2120): java.net.SocketTimeoutException: failed to connect to /10.143.156.5 (port 8080) after 60000ms: isConnected failed: ETIMEDOUT (Connection timed out)
08-04 12:30:03.849 E/MmsService(2120): at libcore.io.IoBridge.isConnected(IoBridge.java:232)
08-04 12:30:03.849 E/MmsService(2120): at libcore.io.IoBridge.connectErrno(IoBridge.java:171 )
08-04 12:30:03.849 E/MmsService(2120): at libcore.io.IoBridge.connect(IoBridge.java:122)
08-04 12:30:03.849 E/MmsService(2120): at java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:183)
08-04 12:30:03.849 E/MmsService(2120): at java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:452)
08-04 12:30:03.849 E/MmsService(2120): at java.net.Socket.connect(Socket.java:884)
08-04 12:30:03.849 E/MmsService(2120): at com.android.okhttp.internal.Platform.connectSocket (Platform.java:117)
08-04 12:30:03.849 E/MmsService(2120): at com.android.okhttp.internal.http.SocketConnector.c onnectRawSocket(SocketConnector.java:160)
08-04 12:30:03.849 E/MmsService(2120): at com.android.okhttp.internal.http.SocketConnector.c onnectCleartext(SocketConnector.java:67)
08-04 12:30:03.849 E/MmsService(2120): at com.android.okhttp.Connection.connect(Connection.j ava:152)
08-04 12:30:03.849 E/MmsService(2120): at com.android.okhttp.Connection.connectAndSetOwner(C onnection.java:185)
08-04 12:30:03.849 E/MmsService(2120): at com.android.okhttp.OkHttpClient$1.connectAndSetOwn er(OkHttpClient.java:128)
08-04 12:30:03.855 E/MmsService(2120): at com.android.okhttp.internal.http.HttpEngine.nextCo nnection(HttpEngine.java:341)
08-04 12:30:03.855 E/MmsService(2120): at com.android.okhttp.internal.http.HttpEngine.connec t(HttpEngine.java:330)
08-04 12:30:03.855 E/MmsService(2120): at com.android.okhttp.internal.http.HttpEngine.sendRe quest(HttpEngine.java:248)
08-04 12:30:03.855 E/MmsService(2120): at com.android.okhttp.internal.huc.HttpURLConnectionI mpl.execute(HttpURLConnectionImpl.java:437)
08-04 12:30:03.855 E/MmsService(2120): at com.android.okhttp.internal.huc.HttpURLConnectionI mpl.connect(HttpURLConnectionImpl.java:114)
08-04 12:30:03.855 E/MmsService(2120): at com.android.okhttp.internal.huc.HttpURLConnectionI mpl.getOutputStream(HttpURLConnectionImpl.java:245 )
08-04 12:30:03.855 E/MmsService(2120): at com.android.mms.service.MmsHttpClient.execute(MmsH ttpClient.java:162)
08-04 12:30:03.855 E/MmsService(2120): ... 6 more
08-04 12:30:03.855 E/MmsService(2120): Caused by: android.system.ErrnoException: isConnected failed: ETIMEDOUT (Connection timed out)
08-04 12:30:03.855 E/MmsService(2120): at libcore.io.IoBridge.isConnected(IoBridge.java:223)
08-04 12:30:03.855 E/MmsService(2120): ... 24 more

And the same guy has tried with another sim from another operator and all works fine.

A strange timeout :x

Since this log user agent and uaprofil are fixed (replaced by stock values).