How to return item to cancel the contract:
Case 1: With our return envelope
Step 1: Input sim card/ pocket wifi and smart pit card in the return envelope which is included in the order package. Then seal the envelope.
Step 2: Take a picture while inserting in Post Mail (proof of return) then send it to Customer Support.

or you can watch and follow the video below:
Case 2: Without our return envelope
Step 1: At convenience store, fill out a form from the cashier and put sim card/pocket wifi and smart pit card in the box. Write the return address of our company:
Address: MASH UP R Company.
Postal code: 〒111-0053 Asakusabashi, Taito-ku, Tokyo 3-4-4 Yamada Building 2F
Step 2: Send the copy of receipt to our Customer Support.
The delivery fee is free if you use the COD/chyakubarai waybill

or you can watch and follow the video below: