I really, really want to +1 this SCP. The concept is interesting, and the final log is really, really good. There's some parts of it that put me off too much for me to be ready to +1 it, though. So here's my complaints:
"All mental health periodicals and websites are to be monitored for instances of SCP-6576 phone numbers and immediately removed or destroyed." the way this is worded makes it sound like they're destroying the health periodicals/websites themselves rather than just the SCP-6576 advertisements. I presume this is not the case, particularly for the full websites, as taking an entire website down sounds a bit too disruptive.
My main gripe and what really puts me off from upvoting this article is the first log. It's such a nothing segment. Sure, it reinforces the idea that the voice on the other end is telling the truth, but it doesn't do so in an interesting or compelling way. It's incredibly vague with no description of what he was told beyond that it had a positive impact on the people around him or what impact his death actually did end up having. The 93% bit especially bugs me, as that's quantitative measurement applied to something that can only be accurately described in a qualitative way. How do you measure 93% accuracy in what it says? Were 93% of its claims proven true? Were its overarching claims mostly true but 7% off somehow? It doesn't really make sense as a way to measure that. While I appreciate that this part doesn't get too into it or go on for too long so as to harm the pacing, especially with how powerful the following segment is, I think it's much too vague and needs some improvement.
As for the 2nd log, while I overall really liked it, I'm unsure why they deemed her becoming suicidally depressed and being at severe risk to be worth information from an interview with the anomaly, especially when they can evidently quite easily tap into other callers. I also don't really like the handwaving of how she got hold of the gun with a simple 'it is unclear', especially when the implication seems to be that they were taking great care to keep her from acquiring anything to hurt herself with before the test so she wouldn't be able to kill herself before it started. These issues aren't too major, and I can definitely handwave them for how impactful the log was, but I do think it has some edges that could be sanded down for a nicer presentation.
I hope my critique made sense, I've been super sick and out of it lately.