http://smartgamesandpuzzles.com/inventor/Home.htmlinvented it. In the last 5 years Raf has invented a slew of puzzles!
The grid has tiles that are 2 by 1. Some of the tiles have circles. The object is to move the tiles around so that the circles hover over the telephone numbers of your friends. Notice that each friend has only a 5-digit telephone #!
There are 32 challenges. I have not done them all. But I have done the 'expert' levels. And the solutions can be tricky for a novice puzzler.
Smartphone is not easy to find. Check with Puzzle Master to see if they have any in stock.