You can cancel (if you're a new customer and not assuming another customer's service) WITHIN 30 DAYS of accepting. You'll still be responsible through that date for the new service and any charges associated with it.
A change in your service address or the location to which any Service is provided to you may constitute, at our sole discretion, termination of the Services or an increase in the prices you must pay for the Services.
Except as provided below, if a change we make to the Agreement is material and has a material adverse effect on you, you may terminate each line of Service materially affected without incurring an Early Termination Fee only if you: (a) call us within 30 days after the effective date of the change; and (b) specifically advise us that you wish to cancel Services because of a material change to the Agreement that we have made. If you do not cancel Service within 30 days of the change, an Early Termination Fee will apply if you terminate Services before the end of any applicable Term Commitment.