Since your community join date is 6/27/2011, I am going to go out on a limb and assume that you purchased an Evo3D recently and that you received your first bill. I will further assume that it is much, much more than the monthly quote.
Explanation: Your first month's bill will be more than your other months. The way postpaid cell phone service works is that your first bill includes your charges to date (prorated monthly charge), which includes your activation fee and the cost of the phone if you charged your account. Also included are the full charges for the next full billing cycle, including estimated taxes.
Normally you might want to call customer service by dialing *2 on your cell phone or else 1-888-211-4727 from a landline and a customer service representative will be glad to go over your bill and explain your charges to you. If you don't want to call, you can private message me and I will reply back to gather more information from you.