Hey members,


Hope you all are enjoying your day.


In our day to day life we are surrounded by the applications of science, right from the LED bulbs, T.V., clock, smartphones, etc.These all are the things which you can see and touch.


But there are some applications which you can't see or touch or feel, and among such technologies there is the one which help us to connect with our loved ones no matter how far they are, the technology which shatters the boundary walls placed due to distance between persons.

Yes, you are guessing it right I am talking about mobile communication, some of you also know this by the name of telephone calls or calling feature.


But like all communications this one also requires a medium, and that medium can be:-

1. Wired

2. Wireless

and the web of such pathways came to be known as the Mobile Network or  Cellular Network.


cellular network or mobile network is a communication network where the last link is wireless. The network is distributed over land areas called "cells", each served by at least one fixed-location transceiver, but more normally, three cell sites or base transceiver stations also known as Mobile Tower.

These base stations provide the cell with the network coverage which can be used for transmission of voice, data, and other types of content. A cell typically uses a different set of frequencies from neighbouring cells, to avoid interference and provide guaranteed service quality within each cell.


These cell patterns roughly take the form of regular shapes, such as hexagons, squares, or circles although hexagonal cells are conventional. Each of these cells is assigned with multiple frequencies (f1 – f6) which have corresponding radio base stations. 

The group of frequencies can be reused in other cells, provided that the same frequencies are not reused in adjacent cells, which would cause co-channel interference( we know this by noise while taking calls).



The first commercial cellular network, the 1G, was launched in Japan. It was an analog wireless network. 

The wireless revolution began in the early 1990s, leading to the transition from analog to digital networks. The first commercial digital cellular network, the 2G generation, was launched in 1991.


The most common example of a cellular network is a mobile phone (cell phone) network. A mobile phone  is a portable telephone which receives or makes calls through a cell site  (base station) or transmitting tower. Radio waves  are used to transfer signals to and from the cell phone.


Modern mobile phone networks use cells because radio frequencies are a limited, shared resource. Cell-sites and handsets change frequency under computer control and use low power transmitters so that the usually limited number of radio frequencies can be simultaneously used by many callers with less interference.


A cellular network is used by the mobile phone operator  to achieve both coverage and capacity for their subscribers. Large geographic areas are split into smaller cells to avoid line-of-sight signal loss and to support a large number of active phones in that area. All of the cell sites are connected to telephone exchanges  (or switches), which in turn connect to the public telephone network .


There are a number of different digital cellular technologies, including: Global System for Mobile Communications  (GSM), General Packet Radio Service  (GPRS), cdmaOne , CDMA2000 , Enhanced Data Rates for GSM Evolution  (EDGE), Universal Mobile Telecommunications System  (UMTS).


As technology advance we came across 4G and 5G (which we are using currently).


I included the above knowledge because it helps you to understand VoWifi with greater ease.


Now lets see, what is VoWiFi?

VoWi-Fi simply stands for voice over Wi-Fi. VoWi-Fi is a complementary technology to VoLTE and utilises IMS technology to provide a packet voice service that is delivered over IP(Internet Protocol) via a Wi-Fi network. Where possible, VoLTE calls may be seamlessly handed over between LTE and Wi-Fi and vice versa. Conversational video is also possible via Wi-Fi.


Wi-Fi Calling has been around for a long time. Voice calls have been transmitted over Wi-Fi either in the form of OTT applications such as Skype or as initiatives such as UMA and femtocells to enhance the reach of mobile voice services in subscribers’ homes.


The problem with OTT applications from an operator’s perspective is that the operator loses control. The UMA / femtocell initiatives have proven to be too expensive lacking widespread support among phone manufacturers. In an ideal world voice calling should be totally seamless for the user, built-in natively in the device and work over any network connection.


The technology has been available for some time but operators have been hesitant. They have wanted to protect their voice-related revenue including revenue from roaming charges. However, new business models allowing for flat-fee voice services, combined with the realization that users will use OTT applications for calls as much as they can, has removed the last obstacle for taking Wi-Fi Calling to the next level.


In September 2014, mobile operator T-Mobile  pioneered this next-generation Wi-Fi Calling solution. This is a paradigm shift for Wi-Fi Calling as it is now implemented with native support embedded in the smartphones and working seamlessly through any Wi-Fi connection. Text messaging (SMS) also works in this way.


Benefits of VoWifi

  • Can make calls without the need for a mobile signal (e.g. in a remote location or in a property with thick walls).
  • Benefit from security being based on SIM-based authentication as for VoLTE.
  • Experience better indoor coverage.
  • Make crystal-clear voice and video calls over Wi-Fi.
  • Always keeps you connected in case of network dark spots.


Now, I'm sure that you have a question in mind that, does it affect my ongoing cellular plan or not?


The answer is even with VoWiFi enabled and calls being placed via your WiFi connection, your calls will cost according to your cellular plan , which means that all your plan parameters will apply to the calls made over the WiFi network. 


For example, on Airtel placing a call to any subscriber will not effect you much as they have imposed no IUC on calls but on Jio, placing a call to a non-Jio subscriber will exhaust your IUC minutes.


So make a call while keeping this in mind.


Plus you cannot make international calls using WiFi calling.


How do I enable this?

Simply follow my steps below, and you're good to go! 

Step 1: Open settings.

Step 2: Click on Connections.

Step 3: Enable WiFi Calling.

Step 4: Connect to a WiFi .

Step 5: Place a call (you will see a WiFi calling sign beside network indicators).


Please have a look at the link below for all the supported devices.  

For Airtel users:

For Jio users:


Hope this will clear all you doubts about VoWiFi and now you can use this feature without any discomfort.