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On phones, I’ve had to lock DNS to the OpenDNS resolvers in the Wi‑Fi settings and then block other DNS options on the router, since mobile devices love switching to their own resolvers. For testing whether a site is really reachable, I sometimes use...
I had the same issue and found out SMS doesn't work in the sandbox since it's not connected to real carriers. I used webhook simulations to test flows without sending actual messages.
