Please note that SMS delivery involves multiple downstream providers for the last leg of message delivery. Different destination country have different local laws and regulations to which SMS sender should comply to. For example, sending unregistered SMS to India using SenderID will fail, sending URLs as a part of SMS might fail for Nordic destinations.
Hence it is recommended to follow the best practices mentioned here
Additionally, SMS might also fail in case the destination mobile handset is having some issues. For example, being out of network coverage, mobile storage being full etc. Please do enable Delivery Status Logs following the steps mentioned here to understand why SMS is failing.
However, if you require additional help, reach out to AWS Support with at least 3 latest delivery logs for further investigation.
The best AWS service for sending SMS via REST API callsasked 7 months ago
We want to understand the pricing of sending SMS using SNS and what is Variable Pricing for Amazon SNS SMS Notifications to Rest Of World (non-US)?asked 3 months ago
SMS charges via SNS 20X high then actualAccepted Answerasked a year ago
Pinpoint SMS - International Usageasked 6 months ago
SNS service SMS sending is failing sometimes.asked a year ago
SNS block send SMS for specific countriesasked 5 months ago
Some SMS return with status: " Phone has blocked SMS"asked 5 months ago
AWS SNS - Unable to send SMSasked 5 months ago
SMS validation (SNS)asked 7 months ago
Unable to send SMS through AWS SNS?asked 2 months ago