Hi,
When I send a sms thru fma with a tel number in international format (exemple : +336123456789), I never receive a proof of delivery. It's the same problem when I answer a SMS because the number automatically used by fma is the number included in the header of the previous SMS (international format sent by telecom provider).
When I send SMS (international format) to the same contact directly on the phone, I receive a proof of delivery.
Did you ever encounter the same problem ?
Best regards,
Emmanuel