To retrieve your SIM card number (ICCID) number, begin from the home screen:
1. Select “Settings.”
2. Click on "About Phone" or "About Device" depending on your phone model.
3. Click “Status."
4. Choose "ICCID" or "IMEI Info" to see your number listed.
If your phone will not power on, you can simply get the SIM card number by ejecting it from the SIM slot or by pulling it out from a tray on the phone. Androids can have different locations for the SIM card. Occasionally, a SIM tool or push pin may be required to open a SIM tray. If your phone has this design, simply put the tool or the push pin into the small hole located next to the tray and it should eject the SIM card.
You can check your phone's compatibility here.