I HAVE PURCHASED THIS PRODUCT FROM MTS STORE BUT THERE I AM FACING RINGER PROBLEM, (IF WE CHANGE SD CARD OR SIM THAN IT BECOME SILENT FOR MINIMUM 5 DAYS , NO OUTPUT OF VOICE EXISTS THROUGH ITS PHONE SPEAKER IN ANY MODE, EITHER WE TRY YOUTUBE OR SD CARD MUSIC FILE OR ANY OTHER RINGTONE OF THE PHONE, IT JUST VIBRATE)
NETWORK AND INTERNET ACCESS
SOUND AND PROCESSING