/// <summary>
        /// Send message
        /// </summary>
        protected override async Task Send()
        {
            ClearErrorFile();
            IEnumerable <PhoneNumber> numbers = GetPhoneNumbers();
            var mms = new MmsMessage(numbers, Message, AttachmentFiles);

            OnMessagePrepared(mms);

            CurrentMessage = await _mmsService.Send(mms);
        }
        /// <summary>
        /// Send message
        /// </summary>
        protected override async Task Send()
        {
            ClearErrorFile();
            var attach = new List <StorageFile>();

            if (File != null)
            {
                attach.Add(File);
            }

            IEnumerable <PhoneNumber> numbers = GetPhoneNumbers();
            var mms = new MmsMessage(numbers, Message, attach);

            OnMessagePrepared(mms);

            CurrentMessage = await _mmsService.Send(mms);
        }