TOP 5 reasons, why SMS or text messages fail to get delivered.
When you call your friend and the phone is switched off or out of carrier’s reach, you know that instantly.
With SMS, it is much-much more complicated, as most of the heavy-lifting is done without you knowing it.
1) Phone is switched off or out of carriers reach
If you get busy signal while calling, you can try again later or just give up. When the SMS does not get delivered on the first try, it is automatically re-sent in certain intervals without you knowing it. So when the phone is available again, the message still gets delivered.
Note: Messente.com is configured to try to deliver messages in 6 hours. When the message still fails, it is marked as Failed.
2) False negative
Sending SMS requires to also receive Delivery report (DLR) from carrier or operator. When the operator fails to respond with correct receipt, sender does not know, that the message actually got delivered and marks it as Failed.
NB! USA, Canada and most Latin-American countries are known not to provide delivery reports at all.
3) Number is in roaming (abroad)
Sending an SMS to number that is currently not in home-country, is always causing lots of problems and therefore delivery to numbers in roaming is not guaranteed.
4) Sender you are using is prohibited
Some countries or operators are blocking some types of Senders. Japan for example does not allow to send SMS from regular phone number. Telia Sonera in Finland on the other hand is blocking messages from Alphanumeric senders like “CarService1″ or “BestHotel”…
5) Carrier is blocking the SMS
Operators are also known to block some SMS routes from time to time. This also requires SMS services to re-route the message via another working route and this also can cause temporary delivery issues.