A method for detecting SMS messaging service interruptions by classifying SMS messages as delivered or undelivered based upon the receipt of a successful conversion message within a predetermined time period. A current conversion rate is calculated for each network operator partner and destination network pair and the current conversion rate is compared against a reference conversion rate to identify a decrease in the conversion rate of the SMS messages. If the conversion rate decrease exceeds a predefined value, the channel between the network operator partner and the destination network pair is flagged and subsequent SMS messages are routed to end users via an alternative destination network.