Texting to the mobile also requires the mobile to be mobile, J52, not sitting still as a statue on an allotment bench. 
I watched my DH the other day in our local supermarket. I'd gone through checkout and his way of looking for me was to march purposefully past all tills, looking straight ahead, ignoring my frantic waving. Then he disappeared, to reappear in the distance, marching purposefully past all aisles, looking straight ahead. This is what I call his Cap'n Mainwaring mode.
I was ringing his mobile. I knew it was fruitless.