How to send short messages to Japanese mobile phones by computer?

If you send it to the other party by mobile phone, you can directly send the Japanese area code plus the mobile phone number, and the charge is one yuan. If you send it by computer, you must first apply for an email address of Yahoo China, and then tell the other party your email address by phone, and ask the other party to send you a short message by mobile phone. If the other party has opened e-mail, it can be sent to you for free. You can save his mobile email address and give it to him for free. Many Japanese mobile phones have opened the e-function, and the monthly cost of sending pictures is 320 yen.