Follow the steps below if you are unable to send text messages from the Iridium 9555 or Iridium Extreme.

Solution 1: Program service center number 

1. Press Menu
2. Scroll to Messages, and press Select
3. Scroll to Settings, and press Select
4. Scroll to Service Center, and press Select
5. Clear the entered number
6. Enter 00881662900005, and press OK
7. Take the phone outside, orient the antenna, register to the network and then send a test text message  

Solution 2: Check dialing pattern

1. When prompted for the destination number, press and hold the 0 key until the + appears
2. Dial the country code, area code and phone number 
• Example: + (country code)(area code/city code)(phone number)
• Example: + 1 416 253 6008