Not to own a cellphone?
Using that logic I would avoid all the motor vehicle laws by just using my horse and wagon ...
Wireless communications have the same protections by law as wired (land line)
18 U.S. Code § 2511 - Interception and disclosure of wire, oral, or electronic communications prohibited | LII / Legal Information Institute
There is an exception of foreign intelligence and counter intelligence and hair-splitting over wireless meta-data collection.
Don't conspire to commit acts of terrorism or crimes on a wireless device or Internet IM. The only problem that is legitimate is personal and business privacy of legal communications. As a business, I wouldn't want anyone intercepting our internal business communications and profiting from that knowledge illicitly.
But then, we are a little more sophisticated than talking on cellphones and messaging on Skype -- countermeasures to ensure privacy are in place ...