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Twilio is my recommendation but...maybe you want to try kall8.com?
They are definitely adult-friendly, I've been with them for many years. They will negotiate pricing for high-volume accounts.
They added texting this year or last year I'm not sure...I have talked with some clients through text but I don't use it for notifications or advertising...just to make a quick connect with certain people. They are pretty specific in what can and can not be sent.
Now the downside to kall8 may be that kall8 has just signed a purchase agreement with Magna5 (M5) to combine companies and so there will be some new leadership. I have a contract with them so I'm not worried now but once my 2 years is up...they could boot me out.
Those are my only suggestions.
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