After much research, I have found the following: This seems to be a problem specifically with unlocked phones, regardless of the carrier. Until Samgung decides to put out a fix, I figured out a work around. I am sending all texts as MMS group messages, using my home landline as the second number. There is no message kick back saying its a landline phone like back in the old days lol. All of my messages are going through immediately with no issues. My life is now complete. I hope this helps some of you :)
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Exact same problem. I have an unlocked S7. I use Straight Talk, phone uses Verizon's towers. Bought it refurbished through Best Buy in April. Worked perfectly until the update. After the update, the first text will send and get delivered immediately although it will scroll like it’s sending for 2 minutes and say it failed. It takes 2 minutes for every text to send and will only send one at a time. For instance, if I send 4 texts one right after the other, the first one gets delivered immediately, every one after that takes 2 minutes each to get delivered ( 4 texts take a total of 6 minutes). They all come back as failed. I did a factory reset, started in safe mode and everything in between. Talked to all the tech people and their brothers and finally called Samsung. They told me to take it to Best Buy’s Samsung tech guy to have the operating system and update reinstalled . Texting was fixed after that but my gallery and Samsung Cloud stopped working. I dealt with that for a few days and then there was another update installed. Surprise, surprise, now I’m back where I started!! Going to try the reinstall again in couple of days at Best Buy but I’m guessing the same thing will happen. Something in the system is preventing the updates from installing correctly. New phone, only 30 day warranty because it’s refurbished. Anyone find a solution, please pass it on. Thank you.
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