Call drop issues are not a new problem. Frankly speaking we have been facing this issues from the start we began to use mobile phones!
This problem is more eminent in the areas which have less mobile network coverage particularly in offices, College halls rooms etc, which are located deep in the interior of the apartment or building OR areas which have very less mobile towers.
As more and more subscribers are coming the problem is becoming more worse such that people are demanding the mobile operators that they provide only good mobile data and the subscription would manage it via WhatsApp calls!
Relation Between Vowifi and VoLTE
Before going in deep about VoWifi. I'll explain you the main relationship between Vowifi and VoLTE which became popular with introduction of Jio service.
So with VoLTE (Voice over LTE) you get Internet as well as Calls on the same signal or frequency. Your voice as well as mobile data are together encrypted and sent to your mobile operator.
As compared to the traditional network where mobile data and calls were on different frequency.
But now this is where the main problem starts. When your network is less your Internet would also be slow hence as a result your voice is also affected with several random pauses between tour speech.
VoWifi helps to solve this issue. It brings a brigde to provide voice facility with the help of your local wifi internet.
Concept of VoWifi
To solve the issue of poor call quality of VoLTE and take advantage of local wifi internet. Engineers came up with the concept of VoWifi.
The main crux of VOLTE is internet data. But if you want only Internet then why only through your mobile data. You can have it through your local fast and uninterrupted wifi. Therefore your voice data would be sent to your mobile operator via available wifi.
But as Wifi is usually unsecured network. You can get wifi on hotels, cafes or public places. Hence there is a risk of your voice being heard by a third party like "man in middle" attack. Hence VoWifi use the technology of IP SEC and Encryption. Talking in simple words it forms a VPN connection. It forms a tunnel between Wifi in which your phone is connected and the mobile operator's server. So the things coming in between like voice data are encrypted. So when you recieve any calls it would be routed via wifi.
But!! the catch in this technology is that for the secured connection as described earlier which is to be formed between your mobile phone - Wifi,
It is necessary to have at least 10% of the network coverage hence obviously if you remove your sim card VoWifi won't work.
Local wifi acts as only a major supporter of mobile networks but not a total alternative to mobile network.
Also note that this mechanism starts when you pick your call.
Plus it is not free, Your call balance if you have would be deducted as and when you speak according to your operator's normal plan or IUC charges.
How to use it
The main constain is the support of operator. As of now major operators like Jio and Airtel have support for it. Plus you can use both in dual sim mode
Now to eneble on you Samsung Device
Navigate to and open the Phone app.
Tap More options (the three vertical dots), and then tap Settings.
Tap Wi-Fi Calling and then tap the switch to turn the feature on.
Wi-Fi calls will now be enabled.
To turn Wi-Fi Calling off, just tap the switch again. You can also enable Wi-Fi Calling from the Quick settings panel.
Swipe down from the top of the screen using two fingers, and then tap the Wi-Fi Calling icon to turn it on.
You can also change the settings to change the preferences for that :-
Navigate to and open the Phone app.
Tap More options, and then tap Settings.
Tap Wi-Fi Calling.
You can also open the Quick settings panel by swiping down from the top of the screen using two fingers.
Then, press and hold the Wi-Fi Calling icon.
The following settings are available:
Cellular Network Preferred: Your cellular network will be used for calls. If cellular network is unavailable, Wi-Fi will be used. ￼
Wi-Fi preferred: Your phone's Wi-Fi network will be used for calls. If Wi-Fi is unavailable, cellular network will be used.
You can find the list of supported Samsung phones as below
Samsung Galaxy J4 2018
Samsung Galaxy A6
Samsung Galaxy A6 Plus
Samsung Galaxy A10
Samsung Galaxy A10s
Samsung Galaxy A30s
Samsung Galaxy A5
Samsung Galaxy A50s
Samsung Galaxy A70
Samsung Galaxy A8
Star Samsung Galaxy A8+
Samsung Galaxy A80
Samsung Galaxy C9 Pro
Samsung A5 2016
Samsung A7 2018
Samsung A7 2016
Samsung A9 2018
Samsung Galaxy A9 Pro
Galaxy C7 Pro
Galaxy Core Prime 4G
Galaxy J1 2016
Galaxy J2 2018
Galaxy J2 Ace
Galaxy J2 Hybrid Tray
Galaxy J3 2016
Galaxy J3 Pro 2016
Galaxy J5 Galaxy J6
Galaxy J7 Duo
Galaxy Note 4
Galaxy On8 2018
Galaxy Note 4 Edge
Galaxy Note 5
Galaxy On7 Prime
Galaxy A5 (2016)
Galaxy S20 Ultra
Galaxy S10 Plus
Galaxy J2/ J2 2016
Pro Galaxy A10s
Galaxy J3 (2016)
Galaxy Note 10 Plus
Galaxy S6 Edge
Galaxy J2 Ace
Galaxy J6 Plus
Galaxy A7 2016
Galaxy J8 2018
Galaxy Note 9
Galaxy J7 Duos...... I may have missed some latest lauched phones too. You can check these on your career websites.