I ' m not so sure this would work . You may terminate service for any reason within 14 days of activation . If you purchased a wireless device at a promotional price at the time of activation , you must return it within the device return period to avoid being assessed an Early Termination Fee of $ 175 , or $ 350 if you purchased an Advanced Device . You will remain responsible for your Activation Fee unless you terminate service within three days of activation . You will also be responsible for all applicable usage fees , prorated access charges , taxes , surcharges or other charges that accrued to your account through the termination date . If you paid a security deposit , it may take between 30 and 60 days to process the return of your security deposit . The charges for any service used on the account before the service termination date may be applied against your security deposit . If you cancel your service after the 14 day period , but prior to the expiration of your minimum term , you will be responsible for all of the abovementioned charges , including an Early Termination Fee . It sounds like you ' d get hit with a lot of fees if you didn ' t return your device . or is it somehow different through Best Buy ?