I updated on 2/2/17. Since then I can not send a SMS message to one person. Everyone else is fine that I know of. This person is on my account and the other 2 people on my wireless account are okay and we send messages fine. Today I called her and after we hung up she texted me and it went through then I texted her and it did not work. Sometimes my messages to her say SENT. However, earlier today when she was able to text me my messages said DELIVERED. I cleared cache manually by powering off and holding Volume up, Power and home key at the same time and then when it starts keep holding Volume up and home key. I even deleted her number and texted just her number and still the issue. Please help.