Hacker News new | ask | show | jobs
by kop316 1737 days ago
...whoa, yeah same here. tried "test spot.xyz" then "test spot.com" T-mobile <-> T-Mobile. "test spot.xyz" did not send. Even weirder, I got a confirmmation that it was delivered.

It looks like T-Mobile looks for ".xyz" within the SMS and will silent drop the SMS (though it will claim it is delivered). ".xxyz" works, "..xyz" or ".xyzz" does not. "xyz" works, so does ".xy".
2 comments
DaiPlusPlus 1737 days ago
> though it will claim it is delivered

I thought SMS didn’t have delivery receipts?

link
kop316 1737 days ago
They certainly do. In Chatty: https://source.puri.sm/Librem5/chatty/-/merge_requests/786 . Some carriers even charge for the service (!!): https://source.puri.sm/Librem5/chatty/-/issues/434

MMS has delivery reports too (I implimented support for it myself for mainline Linux Phones). It even has read reports, but no carrier seems to honor using it (which is why I didn't bother to impliment it).

I'm not sure if Android/iOS gives the user an option for it (which may be the source of confusion).

link
frosted-flakes 1737 days ago
There is an option to enable delivery receipts on Android (Google and Samsung). I believe it is disabled by default.
link
kop316 1737 days ago
Read reciepts or delivery reports?

I'm not sure if SMS supports read reciepts, but I didn't think so. The MMS standard allows for read receipts ("MAY" not "SHALL"), I was unable to get it working, and I suspect it's due to no carrier support.

I was unable to get read receipts working at all, and I suspect it's because the carrier doesn't impliment it.

link
frosted-flakes 1737 days ago
Delivery receipts, I've edited my comment. I've never been able to get read receipts to work. If I enable it, sometimes I will receive an actual text message that "123-456-7890 has read your message", instead of just marking the message as read.
link
kop316 1737 days ago
Ahh, fair enough, thanks!
link
davchana 1737 days ago
Many years ago when incoming messages used to cost, each delivery report I recieved after sending a message out costed me exactly one incoming message, in India in 2000s. Many phones still offer Request Delivery Reports.
link
pope_meat 1737 days ago
Use signal. If you're encrypting your message, they can't filter your message out.
link
kop316 1737 days ago
Respectfully, I do use signal, my family, my boss, most of my friends, etc. do not, they use SMS.

Also, Telegram seems to be much better supported on the Pinephone as of now, so that is what I generally prefer.

link