"Online Price" is generally the same as prices offered at our AT&T company-owned retail locations, however, phone prices and selection may vary. Phone prices at retail locations may also vary based on rate plan or contract length. Online prices are subject to change and/or periodic promotional offers. Online prices are available only when ordering online, and requires either new activation for service or contract renewal. Each requires a two-year service agreement, except purchases with GoPhoneŽ service. In certain states, sales tax is calculated based on the un-activated "Retail Price".