How do I send SMS messages from my device? 08.02.2016 01:20 PM
SMS messages sent from the AT&T Control Center platform to the device (via API or UI) will come from 5277. If you want to send an SMS from your device to the AT&T Control Center platform, send to 53340003. The message will be associated with the MSISDN/IMSI/ICCID of the device in the AT&T Control Center platform. You¿ll be able to view the SMS in Control Center: Device > Click on specific ICCID > SMS tab.