Most major phone companies, such as Sprint, Verizon and AT&T, make customers' phone bills available to view on their company websites. You need a personal account with a user name and password to view your bills, which you can create with your phone plan account information.
To view your Sprint phone bills, go to Sprint.com, and sign in with you account information. This takes you to your account page, where you can view your account balance, current and past bills, and payment options. Click on See My Bill to view your most recent phone bill. Sprint posts your current bill for viewing about one week before your payment is due, and they also send a reminder email once the bill is posted.
If you have a plan with Verizon, go to the company's website, and click on the My Verizon tab to view your bills. You can find a View Bill link in the Bill & Payment heading in the My Verizon tab. To view your phone bill with AT&T, log in to your myAT&T account, click on Billing & Usage, and choose View My Bill. The bill is in PDF format, so you need Adobe Reader to view it.