I expected my first iPhone bill to be a bit high but not a lot. It came out to $150!!! Is this normal?? I have the lowest calling plan available(39.99) and the higest data plan(40.00). That would equal to about $80 and I know there is tax and an activation fee of $35. It would be about $115.00 without tax and I don't think tax is $35! Should I call AT&T??