Hello friends today I am shairing my review 2ith oppo reviews some issue the data connection is not stable the symbol H is blinking so it means its connecting and disconnecting and 4g symbols at the signal are blinking too cant use my data! .If you use dual sim with sd card this phone will not work. you can use sd card if you are using only one sim card. you can’t use 2 sim with sd card. But this mobile iss good selfie expertt. you knew in advertising.and make a people smart this smartphone has smartwork also.