Please tell me how to activate the SIM (how to switch) after SIM card arrival/eSIM is issued.

Depending on the SIM type, please check the opening procedure page below and proceed with the activation of the SIM.

＜Customers who have selected eSIM＞
◆For iPhones Click here ◆If you
are on Android Click here

＜Customers who have selected SIM cards ＞
For more information Please check here.
◆If you are using an iPhone Click here ◆If you
are on Android Click here

About errors and troubles during opening Please check this FAQ.