Another widespread misunderstanding is that someone may hack a phone or listen to your calls simply by knowing your phone number. This is entirely incorrect and impossible.
Airplane mode should first be turned on and off. The Quick Settings screen on the majority of Android phones allows you to toggle the airplane mode on and off. If not, you can switch to Airplane mode by going to Settings > Mobile Networks. Activate Airplane mode for at least 30 seconds. To re-connect your network, turn it off once more.
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On your Android or iPhone, you can utilize Wi-Fi calling to place calls rather than using your cellular network. In areas without cell service or in buildings with patchy coverage, Wi-Fi calling is helpful. Not many phones have Wi-Fi calling enabled by default; you must manually do this.
Your phone's cellular and Wi-Fi radios should be turned off. Turning on "Airplane Mode" is the simplest approach to complete this operation. This disables your phone's Wi-Fi radio as well as your mobile radios, preventing them from connecting to their respective networks.
If you have a Wi-Fi connection in an area with little to no cellular coverage, you can make or receive a call using Wi-Fi Calling.
Calling over WiFi is advantageous for several reasons. Most importantly, provided there is an internet connection, it enables communication from even the most remote locales. That means that regardless of your location-indoors, outdoors, or even underground-you may make phone calls and send messages.
Simple method is to put the sim in a phone that supports 4 g. (use the slot 1). Go to settings > mobile networks > set the LTE or 4G network preference > manually find the network and attempt to sign up for the 4G network. Your sim is 4G supported if you are able to register.
Another widespread misunderstanding is that someone may hack a phone or listen to your calls simply by knowing your phone number. This is entirely incorrect and impossible. Further details are available here.
Voice over LTE (VoLTE) calls are made using a 4G LTE network. Compared to ordinary phone calls placed via the traditional voice network, they feature better audio quality. VoLTE enables simultaneous voice and 4G LTE data use as well as six-way conference calling.