I've had the exact opposite experience. I don't know how many 200 OK I've received but the message was never delivered (and soooo many times during vital demos

I've had the exact opposite experience. I don't know how many 200 OK I've received but the message was never delivered (and soooo many times during vital demos). I had several support cases with them and they simply ignored me. My product is built around SMS so I could have been easy money for them if it actually worked reliably. I ditched them for Twilio, never had any issues since then. A couple of months later someone from sales at MessageBird reached out to me on LinkedIn and asked if I wanted to try their service. Spilled my guts to him and he wasn't surprised... How certain are you that your messages are delivered? When I started digging, it was scary how often it failed successfully.