All our Iridium monthly plans are for 1 year minimum contract. When you sign up for service you will be charged first and last month up front, your first month is prorated based on the number of days till the end of the month. You will pay a one-time $35 activation fee. All calls are billed in 1 minute increments. Early termination fee of $250 per line applies. All calls rounded to the next minute. Outgoing SMS/text message/email charged as 1 minute.