It is an application that performs the conversion of full-width / half-width / hiragana / katakana string.
When you got the phone number in the double-byte character string, and I tried to create because it could not be registered as it is.
You can also specify the conversion before the text in the share from other apps.
Please try to convert again replaced the converted text and conversion before the text in the "↕" button when flexibility in conversion method does not work.