There are additional fees which could appear on your bill. Here is a list of the fees and what causes them:
Late Fee: A one-time $10 late fee will be applied to next month’s bill if you do not make a payment within two days of your bill due date.
Restocking Fee: A one-time $30 for any device returned with an open box.
Activation Fee: A one-time $10 fee per line will be charged to initiate service.
Change of number fee: A $10 fee will be charged if you would like to change your number. This does not include the initial porting of your number from another carrier which is completed free of charge.
Returned Check Fee: A one-time fee of $20-$30 (varies by state) will be charged for a bounced check. It is highly recommended that you pay your bill online.