It's probably best to contact them via email since there's often no cell signal where they're travelling.

So this cell signals both onset and offset of a small spot over a small region of the visual field.

It does this by blocking cell signals.

Sam's patience, never exemplary, was fading with the cell signal.

If you have a cell signal, you can download a new book.

The area's lush, hilly terrain contributes to its appeal but obstructs the lines of sight needed for clear cell signals.

By manipulating the cell signals during the blastula stage of development, various tissues can be formed.

I can't get a cell signal from here to Queens!

There was no cell signal in the stairwell.

In other words, the 85th caller will not get a cell signal.