🔍 Key Concepts

• Iridium dialing format for calls from a handset to a landline or mobile • Meaning of 00 as an international access prefix on satellite systems • Difference between country code, subscriber ID/phone number, and IMN (Iridium Mobile Number)

💭 Think About

• When you place an international call from most satellite or GSM phones, what digits do you usually dial before the country code? • Is the Iridium Mobile Number (IMN) something you, as the caller, normally enter separately from the subscriber’s phone number when calling a regular shoreside number? • Look at which choices add extra symbols (*, +, #) and ask: are these normally part of an Iridium-to-shore dialing sequence?

✅ Before You Answer

• Verify which options correctly start with 00 for international/satellite access. • Check whether the correct format uses only country code + subscriber number, or if it also requires entering a separate IMN when calling shore. • Eliminate any choices that add unnecessary symbols (*, +, #) that are not part of the standard Iridium voice dialing procedure to a shoreside destination.