Lumia 650 dual sim – erratic SMS delivery confirmation behavior
Maybe a little addition -I have here actualised Lumia 730, 735 aside (with the other SIMs from the same operator), but both of the phones with the same build and actualisation are effective properly and giving the “Delivered” message (in Czech “Doručeno”) and
no old fashioned SMS or comparable appears.. So this is the reason why I think it is bound with the Lumia 650 implementaion.
For further question I am ready to answer.