Not that my group ever asked, but my answer for them as to why it took so long to build back up a Wireless Networking system was two-fold.
First: During Crash 1.0, commercial Cell Phone Networks suffered the most, with power surges slamming and destroy expensive equipment, and a lot of the infrastructure for the Cell Phone Network that didn't have redundant systems in place (Like the Police Cell Phone System, which is where the technology originated in... The 1930s, I think?) was totally wrecked. As well, there was massive riots against Communications Corporations, with the Mob blaming them for the Crash, which took out even more equipment and, more importantly, trained personnel needed to run the system.
Second: Fiber Optics, while expensive to lay down, didn't suffer from the "Burn Out" that POTS and Wireless systems did during Crash 1.0, and Governments/Corporations heavily invested in them as they were "Safe" from the points of view of the people in charge (Remember, these people are not completely tech savvy, and it was a very scary time.).
Were I ever to run a game in 2050, cell phones would be just coming back into popularity again as small companies are able to be built networks and finally moving away from the hysteria of Crash 1.0. Say, Early- Mid-2000s in popularity. Payphones are still available (And have video or even holo capability!), but the size of the phones are about the size of a flip phone, or even wrist-mounted models for higher-end models. Pocket Computers are basically Smartphones, but aren't called that due to marketing trying to stay away from the hysteria that might still abound. The Megas will buy them up around the late-'50s, early-'60s, and start the move to the Wireless Matrix Initiative.
But, well, that's me.