i think it will be useful for people, it will be developed in next versions.
Please send me your comments.
1. You want to create numbers.txt file in your computer and put there phone numbers separated by comma.
2. Connect your phone to computer via USB cable or some other way.
3. Open \Android\data\com.mchikvaidze.SMSSender\files directory and past your numbers.txt file (chapter 1).
4. Open app put message body and press Send SMS.