I wonder how he kept track of all the phone company employees he gained the trust of, etc. Being blind he probably couldn't write things down easily. I also w

I wonder how he kept track of all the phone company employees he gained the trust of, etc. Being blind he probably couldn't write things down easily. I also wonder if he could have avoided being caught indefinitely by keeping track of information better and taking more precautions. How long would it take a superintelligent computer to effectively take over the world with nothing more than phone access?