Can you turn off your cellphones?

Is online banking fraudulent? Why can I not turn off my cellphones? Is it fraudulent to have those "codes" come to your cell phone when "verifying"? What if you "lost or had your cellphone stolen"?

My dad was brilliant, because he did not use online banking and always had his bank statements mailed to his home......Do you?

Please assist elderly by removing them from online banking and discover a safe way for them to assess their money!!!

He did not "trust" technology at all!!!