I bought my samsung evo 16gb sd card from flipkart for 297rs. I use it on my smartphone for daily use and till now it is working perfectly. Using some sd cards may hang your phone but it does not cause any such problems and also no heating problems. The reading and writing speed of the sd card is excellent. It works smoothly on my phone and it is highly good especially for android phones. It is a class 10 sd card so its performance is absolutely good. Formating of the sd card is also very easy. In my experience I recommend it to all, so go for it guys.