What does “delivered upstream” mean?
This means that the SMS has been submitted to a network but no status report has been received from the mobile network.
There are several factors that can contribute to the message delivering swiftly by the carrier:
- Recipient signal strength and connection to the network
- Problems with the network
- Carrier issues.
To track down the delay, please check your delivery reports and error codes that are available in our customer portal my tyntec.