If you are not fully, 100%, certain that you know how to control the 3G CELLULAR DATA on your smartphone device, you should NOT put it on the Standard Pay As You Go plan. At all. Period.
We see customers every week who "feel confident" that they know how to control their 3G CELLULAR DATA, so they will go ahead and add an $80.00 PIN immediately to their smartphone. Then, a few days later, they email us frantically asking where their money went to, and I hate to say it, but we have to say "told you so."