Last night a friend sent me a text message. Part of the message was normal but after each period the word STOP. Appeared. The last line of the text was STOP will advise. Anyone know what this means. He has an LG lucid that is three years old and im using a galaxy s4 that just updated to lollipop a month or so ago. He hasn't returned my text so im just curious if its just something he sent by mistake or if its one of our phones acting funky.