PackGram is a free application, with PackGram you can send bulk messages to all your Telegram group members by one click, so you can promote your business, your websites, your apps or even your self.
*Once you signup you will receive free points, each point equal to one private message to a group member, but don’t worry if you spent all your points you can always buy more points, even if you don’t want to buy you still can get more points by watching reward videos.
*Select a Telegram group of a certain interest related to your business or promotion from your personal groups or any public group using its link.
*Type in the message that includes your promotion.
*Send direct messages to each member of your selected group with your name signature.
*See who received your promotional message and their respective available info.
This application is not an official app from Telegram but we used Telegram APIs and here are the rights to use them https://telegram.org/faq#q-can-i-use-the-telegram-api