In Japan, can I send text messages if I know my mobile phone number?

First of all, Japanese people use mobile phones to send emails in their daily lives. When they know each other's mobile email address, they can use their mobile phones or computers to send emails to each other at any time. This is the most commonly used by Japanese.

As for what we said about sending text messages to the other party when we know the mobile phone number, it is limited to the mobile phone of the same communication company in Japan, not the same communication company. Only when we know the other party's number can we send text messages. Moreover, this kind of short message has very few words, so the most commonly used contact in Japan is mobile phone email.

Finally, there are three major communication companies in Japan, AU(KDDI), Softbank Docomo(NTT) and other companies, such as WELLCOM, which use fewer people.