At the moment we need several users for our android app RingApp in SERBIA with YETTEL SIM card to help test communications and fight fraud! Applicants will be required to receive test calls from other users - the call will be automatically declined. Users can keep the app working in the background - the tasks will be done automatically. Our RingApp application requires an android phone and SIM card: YETTEL We pay 5 USD for every set of 200 calls via Freelancer. Milestone is 5 USD. To start the contract you need to sign up with your YETTEL SIM mobile number and turn on "Auto-perform tasks" in the "profile" section.