I AM USING THIS ABOUT 2 YEARS. Its sound quality is ver beautiful and good quality. If you call in road side in traffic you must hear its sound very clear and loudly. Its loudspeaker quality is awesome. No. Heating problem after contious using. Its bettery gives best service than other. It takes full charge only 2 hours and its battery charger lasting in 5-6 days after contious using. Which is super service for travelers. Its music system is very nice. Its supported 16 gb memory card. It is a very slim mobile in other mobiles. Its body was very hardy. The style and design is awesome. It is a super size phone cought by hand. It is a user friendly and its always gaves a best service. In this price it is a very lovely mobile.