I'm also having the same exact error. Samsung S7 edge on the Straight Talk Verizon network and since the latest update to Nougat I'm receiving "message not sent" errors when sending SMS. MMS work fine however. Sometimes the SMS are actually going through however, I still receive the same error message. Some messages actually don't go through, but I have no way of knowing which ones actually failed. I've contacted Straight Talk, I've cleared caches, all to no avail. Is this a known bug from the Samsung/Android side? Is there a new update coming out soon to correct this? I'm getting tired of having an $850 phone I can't even send simple texts with.
... View more