String of jumbled text is appended to every incoming SMS with Project Fi

Question

I just picked up a new Honor 8 (running EMUI 5/Android Nougat) and I'm having an odd problem when receiving SMS messages.



Whenever I get a message, an odd string of text with a length of 16, starting with a tilde~, like ~l/Adk/ljAdADFWjlk, is appended to it. This is regardless of my SMS app (I've tried the preinstalled one, Pulse, and Google's Android Messages).



Here's an image of a conversation:



screenshot

Screenshot (click to enlarge)



How can I stop that random string of text from appearing after the intended message?





Edit: For extra details, my carrier is Project Fi (reduced to just T-Mobile on the new GSM-only phone) and the issue occurs regardless of sender, be it an iPhone or Android phone.


— owlswipe | Sources

Answer

It looks like there's something wrong in your carrier's SMS router. You should contact your carrier and ask for support.

There's no encoding issues in this case, so I disagree with @beeshyams . The appended text is a stream of base64-encoded data, which after being decoded, resembles a stream of 11-byte data. According to my experience, it is very likely some metadata of the SMS message you received. You can safely ignore it.


Edit: Merged information from comments.

This is a general phenomenon of using Project Fi's service on a non-Fi phone. Discussions are here and here. A solution is to use Google Hangouts for text messaging.


Appendix: Decoded info from image (re-formatted manually)




$ base64 -d | hexdump -Cv

q/Pj/QAHwY+Jhgg= : AB F3 E3 FD 00 07 C1 8F 89 86 08

jaT2JQAcd3EM7Ag= : 8D A4 F6 25 00 1C 77 71 0C EC 08

BMXciQANmWXBLQg= : 04 C5 DC 89 00 0D 99 65 C1 2D 08

— iBug | Sources

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