Using C-Mail ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯60 - Toshiba A5516T Basic Manual

Using C-mail
C-mail is a service that makes it possible to exchange messages between
two au cell phones that support c-mail. A c-mail message can contain up to
50 double-byte (or 100 single-byte) characters.
Subscribers in the Kanto and Chubu areas do not need a separate
subscription to use c-mail. For subscribers located outside of these areas, a
separate subscription is required.
C-mail Safe Block Function
C-mail safe block function is a function that allows you to reject to receive
c-mails that include accessing URL (http://△△△, https//△△△) or phone
numbers in the c-mail message text.
C-mail safe block function is valid by default. You can cancel the setting if
you want to receive c-mails that include accessing URL or phone numbers in
the message text.
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A message is sent to a phone
number.
Example: 0900001XXXX