You can check the status of your SMS messages by clicking on the "Advanced" link in your account, and then "SMS Sending Log". This will give you a log of all SMS messages you have sent in the last month and their status from our SMS provider.
Additionally, you can click on the "Detail" link associated with each SMS to get a details log of the delivery attempts for each SMS. This is pulled directly from our SMS provider.
There are many possible reasons for delivery failure. The SMS may be delayed in some system along the way, and may be delivered shortly. There may be some routing problem between the SMS providers. The receipient network may be blocking and dropping external messages. The moon may be in the wrong phase!
Unfortunately, SMS is not an entirely reliable transport system. Generally what we've found is that if sending to a particular number works the first time (e. g., a particular user on a particular network), then it's pretty reliable. If sending to a number doesn't seem to work, then it's probably some sort of network interconnect/blocking problem, and there's not much we can do.
Still, there aren't any guarantees, and we've tried to provide you as much information as possible. By going to the "Advanced" -> "SMS Sending Log" screen and clicking on the "Details" link of a message, you can see all the details about how the message was routed and what happened to it as reported by our SMS provider. Unfortunately, this is all the information we have, so if it says the message was "SENT" or "DELIVERED", but it really never arrived, there's no more information we can provide that isn't in this log.
Do you still get charged if your SMS message isn't delivered? Well, maybe.
If the SMS is refused delivery via our SMS gateway, then no, you will not be charged. You can see this situation by going to the "SMS Sending Log" screen and looking in the "Status" column.
If the SMS is accepted for delivery via our SMS gateway, but subsequently for some reason does not arrive, then yes, you will be charged. The reason for this is that SMS messages are delivered to the recipient's mobile by passing it from one network to another network. We pass your email to our SMS gateway, and they "route" the SMS to the recipient through the appropriate networks. Unfortunately, delivery of the SMS is not guaranteed, as multiple networks are involved, and anyone may drop it. Once our gateway accepts the SMS, they charge us for it, and this is why we charge your credits once an SMS is sent.