Recently, I've been having trouble texting just one certain number (the person who I text in the highest volume). The texts are marked as sent in my conversation window, but the other person doesn't receive them and I receive this automatic message from the number 900-080-004222: "[person's number] is a landline #. Reply Y to send all TXT messages to this # as voice messages for $0.25/msg. + std msg fee. Details @ vtext.com, TexttoLandline". This is quite frustrating because I can receive texts from this person, indicating that the number definitely is a mobile phone. I have deleted all prior messages in our conversation and deleted and reentered the 10-digit contact into my phone, but no dice. Please help!
Have you tried replying to one of the received text messages from this number? Has the person recently ported their number to another carrier? Changed phones? Have you moved or changed anything on your device?
I'm not sure why it would suddenly not work if it has in the past, and you KNOW it''s a cell phone. Something changed somewhere - -