Would a sim card(activated) be able to function on any phone regardless of the companies carrier?

List a few alternative options and input and output over the standerd keyboard and monitor. explain their functioning in details.

Apython programming question: assume s is a string of lower case characters. write a program that prints the number of times the string 'bob' occurs in s. for example, if s = 'azcbobobegghakl', then your program should print number of times bob occurs is: 2

Into what form does the barcode reader convert individual bar patterns?