Pretty straightforward but nonetheless peculiar. I received a text message containing an unknown mobile number (originating from that same number). Within a minute, the message had been replaced by a blank white space (no chat "bubble") with only the default chat head icon remaining. I texted "??" but no response.
A cursory Google searches seemed to indicate this number was on the O2 network, so perhaps just some glitch in networking.
Any explanation for this phenomenon? I've never seen it before.