How to understand a Japanese mobile phone bill before you change plans

Quick conclusion

Before changing plans, separate your bill into plan fee, device payment, call charges, optional services, discounts, and taxes. A cheaper-looking plan may not reduce your total cost if you still have device installments or paid options.

What to check first

Look for the base monthly fee, data plan, voice call option, device installment, insurance, content subscriptions, and campaign discount. If you cannot read the bill, ask the provider to explain which items are required and which are optional.

Common bill items

• Base plan fee
• Data package
• Voice call option
• Device installment
• Insurance or support option
• Campaign discount
• Universal service and other small fees

Before switching

Confirm whether your phone is unlocked, whether the remaining device balance must be paid, and whether the new provider supports your payment method. Also check whether the new plan includes SMS and voice calls if you need them for banks, delivery services, or work.