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Why am I getting an error when I try to Send an SMS message via API?

Why am I not getting notifications to my web service when SMS messages are received?

Why doesn’t Verizon / Sprint / etc. deliver all of my SMS messages?

Why am I receiving weird characters on inbound SMS messages?

Why can’t I send Unicode characters in SMS messages?

Why is it taking too long for my message to be delivered to the mobile recipient?

Why does it take too long for a message from a mobile phone to be received by my application?