If you need to copy it, tap and hold the number to see the option. Why You Might Need It
You can find this number directly in your device settings; there is that requires you to enter your SEID. Open Settings . Tap General , then About . seid iphone check link
: If you lose a digital subway or bus pass, the SEID is often the only way for the transit authority to "see" your phone in their system. Unlocking High-Sec Features If you need to copy it, tap and