Hello,
Working with the example ME310_AT_Test it appears the display of the ICCID is truncated by one character.
https://github.com/telit/arduino-me310-library/blob/main/examples/ME310_AT_Test/ME310_AT_Test.ino#L130
On this line only the first 19 characters are being displayed, but the ICCIDs are 20 characters.