I have been using this phone since 3 months . I had not yet seen any lack or bug . It is not hanging . It works properly and smooth . The speed of 4g network on jio phone is amazing . I use youtube , jio tv, jio music, facebook , browser , etc without any buffering or lack. The another thing I love in the phone is that 3.5 mm jack which helps me to listen clear music on my headphone but as we compare to other button mobiles the heavy headphones or eaephones not works properly . Thats why I love this mobile and the other amazing thing is that its recharge is at very cheap rate . I had never seen like that offer on any another sim yet i.e., only ₹50 per month ( Free calling , 1GB data and 100 free sms) . ?