Here you can read about special numbers and special rules when it comes to sending SMS from RecMan.
SMS going to North America must follow special rules, specifically a rule stating that you can not send SMS to the US / Canada without having a US number. This means that SMS sent to these numbers will not have the same sender number as the one you enter in the system but a specific number each time. The number that will be the sender of these SMS is:
+1 7657051254