The Iridium Northern Lights pre-paid airtime plan is ideal for anyone who is going to use their Iridium sat phone solely in Alaska or Canada. This plan will not work anywhere else. Unlike some regional plans you can top-up the Northern Lights plan as many times and as frequently as you require. This SIM/voucher will only allow your Iridium sat phone to work in Canada & Alaska. Topping up this SIM will add the new purchased minutes, but the validity will be extended from the date of top-up (and not the existing expiration date). Can be topped up only with Northern Lights Canada & Alaska Voucher through GTC.