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Sailfish MMS problems - T-Mobile USA

Hi everyone,

Good day to you all. I have been struggling with an MMS problem on Sailfish OS using the T-Mobile USA network for a long time and really need some help. I was wondering if anyone could please offer me some advice on troubleshooting this problem? I would be very grateful if someone knowledgeable could help me. Here are the core details:

Sending or receiving MMS messages only succeeds intermittently
I have zero issues with phone, SMS, or 4G data. The issue is only MMS.
Sometimes it works on the first attempt, other times it can take
many, many tries before it succeeds
This happens with my Intex Aqua Fish (2G) as well as Sony Xperia X running the community port (4G)
I took my Aqua Fish to Spain recently. T-Mobile has a roaming agreement there and it roamed on vodafone.es. Phone, SMS, and data was great BUT I had the exact same problem with MMS over there.
The exact same settings on an Android phone (indeed with the same Xperia X before flashing it) are successful on the first attempt
I tried the older legacy T-Mobile USA settings but have the same problem
Wifi disabled or enabled does not change anything.

I installed the MMS Logger app from the Jolla store. Here is a link with the output of a sample MMS send. This is a very good example because it failed for about 4 minutes and then suddenly succeeded. The whole time the phone was not moved and it had a strong signal:

https://pastebin.com/e4VgCCuG

The only outright error I could see is HTTP Status 2 -- which doesn't appear to be a valid status code! Since it also says "Cannot resolve hostname", I'm wondering if perhaps I could get around this by hard-coding an IP into the hosts file, though I don't know enough about this topic to know exactly what.

Code:

2017-10-05 15:27:58 [mms-transfer-list] Transfer /msg/1543/Send started

2017-10-05 15:27:58 [mms-task] Send[1543] NEED_CONNECTION -> TRANSMITTING

2017-10-05 15:27:58 [mms-ofono] Settings.Address: 100.225.88.199

2017-10-05 15:27:58 [mms-ofono] Settings.Netmask: 255.255.255.255

2017-10-05 15:27:58 [mms-ofono] Settings.Gateway: 100.225.88.200

2017-10-05 15:27:58 [mms-ofono] Settings.DomainNameServers: 10.177.0.34 10.177.0.210

2017-10-05 15:28:18 [mms-task-http] HTTP status 2 (Cannot resolve hostname)

2017-10-05 15:28:18 [mms-task] Send[1543] TRANSMITTING -> SLEEP

Usually I will see this section in the log just repeated endlessly until it times out, but sometimes it succeeds as in the example log posted.

I honestly have no idea how to go about troubleshooting this any further. I used to think my issue was that I had 2G only with the Aqua Fish, which is a very weak signal for me....but after seeing the same exact problem with a strong 4G signal on the Xperia X, I realized it is a deeper problem. I searched the forums and found several people complaining about this on the Nexus 5 but no solutions were posted.

I would be truly grateful if anyone could point me in the right direction. This MMS issue is a long-term headache and is the only thing interfering with an otherwise great Sailfish experience.

Thanks very much, in advance!