iPhone access to delivery service website saves butt

So, my little toy saved my arse by enabling me to recover my account number while mailing a package to an account today. I had to fill out a form and didn't have my account number readily available. Was the delivery service's website painfully slow on the iPhone? The answer is a definite YES, however driving all the way home to my computer, filling out a form again, and then driving back to deliver the package would have taken even longer. This is the exact situation I had hoped for my iPhone to conquer.