Your SIM number is your phone’s unique serial number and usually consists of 19-20 characters.
To find on an iOS devices (iPhones, etc):
-
Check your device settings
-
Go to Settings > General > About
-
Scroll down to locate the ICCID (SIM Card) number
-
To copy, tap and hold the ICCID number until Copy is displayed. Tap Copy.
2. Check SIM Card
-
Pop your device’s SIM tray open. Find the SIM Card number printed on the card
English 
Spanish