You might have had an experience where your SMS failed to deliver. Here are some reasons for it and what to do about them.

DND STATUS OF THE PHONE NUMBER

When a phone number is on DND, SMS cannot be delivered to the phone number except through the international route or the bank route (transactional bind). 

To get your messages delivered to phone numbers on dnd.com are you can ask the recipient to opt-out of DND.  You also use the international route to deliver your messages or apply for the transactional route. 

Another solution is to use the SIMHosting services. This will work for low volume transactional messages. This SIMHosting service is a subscription-based service that attracts either weekly, monthly or annual charges besides the cost of the SMS.

THE STATUS OF THE PHONE NUMBER AT THE TIME THE MESSAGE WAS SENT

The state of the phone number when the message was sent can also affect the delivery of SMS. The phone number may be switched off, out of network area, in flight mode or unavailable to receive SMS.

The messages can be delivered to this phone number by getting the phone into the network area or restarting the phone.

SMS INBOX IS FULL

If the phone’s SMS inbox is full, messages will fail to be delivered to the phone. To resolve this issue the recipient will need to empty his/her SMS inbox to allow these messages to be delivered.

SMS SERVICE NOT RUNNING 

In modern smartphones, there are times the SMS service may not be running to receive messages.

To resolve this issue the owner of the phone might have to restart the phone so that new messages can be delivered.

The above information will surely be of help to ensure good delivery of your SMS.