Look, I'm not going to argue that we shouldn't prevent a cell phone service monopoly, but using the cost of cellphones in the early 1990s as an argument against it isn't even remotely valid.
Computers cost upwards of $2k for a typical desktop in the early 1990s and there were *way* more PC manufacturers back then (remember Computer Shopper magazine?). One could just as easily say "More competitors lead to higher prices. Anybody remember what PCs cost in the early 1990s?" and be equally wrong.
I just put another machine together and it was ~ $1.5k
The first machine I bought was a 486dx2 an it was ~ $1.5k
There are definitely more low end options out there now - but the price of putting a decent machine together really hasn't change that much.