I have

CodePudding user response：

/// your code

TextEditingController _phn = TextEditingController();

_phn = contact.phoneNumber!.number
    .removeAllWhiteSpace()
    .replaceFirst(' 91', '')
    .toString();

/// Modify as

_phn.text = contact.phoneNumber!.number
    .removeAllWhiteSpace()
    .replaceFirst(' 91', '')
    .toString();