Technically, you could live in the modern world without a computer, smartphone or regular access to the internet.
Realistically, you will be essentially unbanked, have trouble filing job applications or even searching for jobs, be basically unable to check your credit report or freeze your credit or otherwise protect yourself from identity fraud, struggle to file your taxes manually and otherwise have poor access to government services, and have a very difficult time searching for an apartment/home to rent/buy, or filing a mortgage application. If you aren’t a property owner already and/or have a good family support structure, lack of regular internet access makes you more than disadvantaged. I’d say it puts you one bad day away from crippling debt and homelessness.