You don't need to enable VoLTE. Insert the Jio (VoLTE enabled) in any slot. By default, VoLTE will be active. If it is not, you can change the network preferences from Network option in settings.
You can check the below video to get more clarity:
You can find full specifications here: Lenovo A5
To hide or protect your apps I would suggest you use App Lock. Heres how.
Now, whenever you open a locked application, you can either unlock it by simply verifying your fingerprint or by entering the unlock pattern. The fingerprints that you have registered for unlocking your device are the ones that will also work with App Lock.
Here is the video guide to do the same
You can check the complete specs of this phone: Lenovo A5
The Lenovo K6 Power is better in terms of specifications but it is much more priced also. So, the Lenovo A5 is better overall.
Processor: The Lenovo K6 Power comes with the Qualcomm Snapdragon 430 MSM8937 processor whereas the Lenovo A5 comes with the MediaTek MT6739 processor.
Camera: The Lenovo K6 Power has a camera of 13 MP with F2.0 aperture whereas the Lenovo A5 has a camera of 13 MP with F2.2 aperture.
There are other better options also in the market.
Check Full Comparison Lenovo A5 vs Lenovo K6 Power
Follow the steps below to make a video call:
Alternatively, you can use Google Hangouts.
Other applications include Whatsapp, Messenger, Duo e.t.c.
You can watch the video below to look at some best video calling apps:
You can see complete specifications here: Lenovo A5
Flash Notifications are used to give Flash Alerts when you get a Call / SMS.
This feature is already there is most phones by going to:
This is really beneficial in alerting without making any sound.
You can also watch below video to help you activate the default feature:
You can check the complete product specs here: Lenovo A5
Hide Photos and Videos on your phone
To hide photos and videos on your phone you will have to download the app named "Gallery Vault" and follow the steps below:
And you will see a confirmation message on your screen as shown in the Image below.
And you are done!
You can also check the video below for your reference:
You can check the complete specs of this phone