Pay up-front for your minutes and top-up online or by phone if you need to.You can choose when we activate your airtime, simply select your activation date during the checkout process. Iridium SIM card with 5000 minutes of airtime, valid for 24 months (730 days) from date of activation. Please contact us to activate the SIM; activation can be scheduled for a future date if you do not wish to have the SIM activated immediately.