A photo in your Instagram must be posted with the geographical reference to a popular public place and a comment:
When will you start making free calls? The answer is on telme.ru @telmecall #telme (your client code)
As you follow all the conditions, your TelMe balance will be topped-up for 50 roubles.
You can post any amount of photos on Instagram from different public places. You will get 50 roubles for each photo.