We got reports from some of our early users that they never got a verification code after submitting their phone number. Amount of verification messages that weren't received is actually fairly significant.

Please note that this only concerns those who didn't receive their initial verification message. if you did receive it and confirmed your phone number, then you have nothing to worry about. Your notifications will be delivered on time once the content you're monitoring is updated.

We are currently using Twilio as our SMS gateway. They have a very impressive list of countries for which they deliver text messages. Here's a link. They're also just a great and easy to use service overall. I personally recommend them to other developers.

We've been told by Twilio that due to provider issues outside of their control, messages in some countries might not be delivered. It's unfortunate, but we're doing our best to report failed deliveries to help Twilio track this issue and resolve it for everyone who'se using their SMS service. Best of luck to Twilio!