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> We tried that in the past, but our business (mostly OTP for banks) do not allow any margin of error at all. The thing is that we would get positive delivery reports which were fake.

SMS delivery reports have a limited connection to reality (but IMHO, requesting them seems to improve delivery rates), but you can (and should) measure conversion and route based on that.

If you have no margin for error, you might prefer directs, but when the direct route stops working, you need an alternative.