Dial your Iridium phone number directly. This can be expensive depending on the network they are calling from.
Use the 2-Stage Dialing service. This enables someone to reach you by dialing +1-480-768-2500 (an Arizona-based number). When prompted, they enter your Iridium phone number and the call will automatically be routed to your phone. There is no monthly fee for this service, however you pay a low per-minute rate to receive the call. The caller pays the rate associated with a call to Arizona if applicable.
Dial the US phone number that you receive if subscribe to the Dedicated US Phone number option. This Dedicated US Phone Number is an option you can add to your monthly service plan. With this you will be assigned your own Arizona-based phone number, in addition to your Iridium phone number. Callers can reach you directly using either phone number. You pay a low monthly fee for this dedicated US number, and a low per-minute rate to receive calls made to your US phone number.