Please follow the below link for procedures and important considerations when using an au IC card with another company's mobile phone.
SIM *1 card is an IC *2 card which contains a unique ID number to specify the phone number and au uses the name “au IC card” for their SIM Cards.
There are 3 sizes in SIM card – standard, micro and nano.
The shape of SIM card differs depending on the device/phone. Please confirm the correct card for the device/phone you are using.