I am unsure how to make local and international calls, how do I do so?

Iridium provides some guidelines here Iridium – Call Guidelines

Example 1 – Originating a call from a landline phone in the United States terminating to an Iridium satellite phone. It does not matter where the satellite phone is located, the dialing is the same.

a) From the landline phone, dial: 011 8816 XXX XXXXX

b) 011, International Direct Dial (IDD) access code for United States/8816 XXX XXXXX, the MSISDNM

Example 2 – Originating a call from a landline phone outside of the United States terminating to an Iridium satellite phone. It does not matter where the ISU is located, the dialing pattern is the same.

a) From the landline phone, (i.e., France) dial: 00 8816 XXX XXXXX

b) 00, International Direct Dial (IDD) access code for France / 8816 XXX XXXXX, the MSISDN.

Example 3 – Originating a call from the Iridium satellite phone (does not matter where the satellite phone is located) to a landline phone located in the United States.

a) From the satellite phone, dial: 00 1 602-752-XXXX

b) 00, for all outbound calls from the satellite phone/ 1, United States country code/ 602, area code/752-XXXX, actual phone number.

Example 4 – Originating a call from an Iridium satellite phone (does not matter where the satellite phone is located) to a landline phone located in another country.

a) From the satellite phone, dial: 00 CC XXXXXX

b) 00, for all outbound calls from satellite phone/CC, country code/XXXXXX, actual number.

Example 5 – Originating a call from an Iridium satellite phone (does not matter where the satellite phone is located) to another Iridium satellite phone.

a) From the satellite phone, dial: 00 8816 XXX XXXXX