> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hologram.io/llms.txt
> Use this file to discover all available pages before exploring further.
# Why does my modem show my ICCID with an extra F at the end?
> Some modems pad ICCIDs with an 'F' character; remove it before using the ICCID in Hologram systems.
## ICCID padding behavior
Some modems (for example, SIM7000) append an `F` to the end of the ICCID. This is due to internal buffer padding with `F` values; the trailing `F` is not part of the ICCID and does not affect SIM performance.
**Note:** If your modem returns an ICCID with a trailing `F`, remove the extra `F` before using the ICCID in Hologram systems (Dashboard or REST API).
