Wow! I know that connecting via text message is important dzylzy! Texting saves time so having this work is a priority for us! Is this person with Verizon Wireless? Do you know what type of phone they have? Review their contact and make sure your not blocking them. Try removing their contact and readding it? Keep us posted?
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Learning about the solution is helpful. I have had text messages that would not open ever. It's like they were corrupt. The O/S seems to keep historical links (Back Button) to old text messages, but when those change or are deleted, it seems to get lost.