🅰️ Yes. You can start using your SIM card as soon as you receive it.

📌 Service Start Date
・For SIM cards delivered by mail, the contract starts on the actual delivery date.
・Due to international shipping, your SIM card may arrive before your scheduled service start date. If it arrives early, you may use it immediately.

📌 Monthly Subscription Fee
・The billing cycle runs from the 1st to the last day of each month.
・Monthly subscription fees are not prorated. (Even if your service starts in the middle of the month, the full monthly fee applies.)

📌 Charges Before the Service Start Date
You may start using your SIM card immediately after receiving it, without waiting for the service start date.

The following charges may apply between the day you receive your SIM card and your service start date:

① Data usage charges (according to your subscribed plan)
② Voice call charges (based on actual usage)
③ SMS charges (if applicable)

⚠️ No monthly subscription fee will be charged during this period. The monthly subscription fee begins on your service start date.

Examples:
・Service start date: May 1 / SIM received: April 29
➡️ You may start using the SIM on April 29. The monthly subscription fee begins in May.
・Service start date: May 15 / SIM received: May 13
➡️ You may start using the SIM on May 13. The full monthly subscription fee for May still applies.