I have been working with some TMo engineers for several days now on this issue. Some light has finally been shed today, although there is still no known solution or work-around. @tmo_amanda, you'll probably want to be aware of this.So for a few days, the official response was that these messages were not coming from T-Mobile. However, I was able to reproduce them very easily and on-demand by swapping SIM cards from one "affected" phone to another. Not all phones are affected (for example, a Pixel 2 XL is not) but some less-popular brands are (OnePlus, Essential, and ZTE, for instance). I had two different SIM cards and both cards were able to reproduce this behavior on-demand every single time I swapped cards from one phone to another. However, reboots, airplane mode, and other such changes did not cause the problem. I understand this trigger is different than what others see, and that's okay. I think we're still working towards the root of the problem and it's good we don't need weak
These are also showing up on a line with an Essential PH-1. These are not OnePlus only. I would guess that some company has a system inadvertently spamming a bunch of users from an old contact list (I've had this ph# for a couple years now before this started up - have also had the line on a PH-1 since November of last year - only started receiving these messages in July).I can confirm for me:1. It's not Ting-related (never had an interaction with them in the past)2. It's not OnePlus related (never had an OP phone)3. It's not WiFi Calling related4. It's not related to the software I'm running on my phone (it survived a factory reset with absolutely no apps installed yet)Even if T-Mobile is not responsible for these messages, they should track down and identify the company who is and request that they stop. It doesn't seem to be malicious spam - it's probably just some bug in some back-end system somewhere sending out these messages.
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