To be clear, some entirely new, and as yet unknown to me, technology could, I suppose, supplant cell phone technology and/or be used in undeveloped areas like used to be discussed in days gone by.
Back then it did seam feasible that the WiFi and DECT tech's might have this potential, but they have never been proven real world as far as I know. Again, that is not cell phone tech and it is not a cell phone tower in the sky.
Besides, it all turned out to be beyond the reach of Sanswire anyway.