Environment
Device
Platform - SMS Page on a specific SIM
SMS response Webhook events
Question
What number would it be safe to use as a destination address from a device?
Answer
Any number that is recognised as a telephone number by Telecom standards. These restrictions are:
The number must be a maximum of 15 digits.
Use two zeros, or '+' to declare country code of the number.
Caution: Use of string guidelines in from field is ok when sending SMS to a device, but should not be used when sending from a device or expecting the device to respond to the SMS.
Cause
All SMS sent from devices with Onomondo SIMs is routed directly to Onomondo's SMSC. Once received there needs to be an active connection to receive SMS, as SMS is stored in our Core.
An active connection can either be:
A user of the platform is viewing the SIM page of the SIM being used to send the SMS
A webhook is set up for SMS Responses from that SIM.
The limitations apply to comply with the ITU E.164 standards for a telephone number. For example, +11234567890 works, but +112345678901245 may not work from device and will not work from the API (a web server set up to reply to a device's SMS using the number provided will receive an API error).