根据以下内容，回答题。 
Telephone Billing Statement_______city Phone Cellular 
City Phone Cellular 
Department of Billing Services 
51 Dublin St．，Suite 301 
Springfield，WI 
Invoice Date：08—15—2006 
Payment Due Date：09—14—2006 
Customer Information 
Name：Desire Eberhardt 
Account Number：1 0003483一FFT" 
Account Information 
Current Charges：$6 1．59 
Outstanding Balance：$35．08 
Total Amount Owed：$96．67 
Pay your bill online at WWW．cpcellular．tom and receive a discount of 3%before taxes are added．If you have questions about this or other City Phone Cellular policies，please contact our customer service department at 1-888—349—5959． 
Billing Summary Amount Owed 
Current Charges： 
City Phone Premium Cellular Package$49．95 
State Taxes$5．65 
Service Fee$5．99 
Total Current Charges$6 1．59 
Previous Charges： 
Balance as of Last Month$55．08 
Payment Received Last Month$20．00 
Outstanding Balance$35．08 
Total Amount Owed$96．67 
How can City Phone Cellular customers receive a discount?