AT&T calls this “HD Voice,” and like T-Mobile, will block voice and data service for phones that don’t support it. If you’re looking for a deeper dive, there are many apps that break down data usage by type. In fact, an hour of streaming video in high-def can cost you up to 1 GB of data! Depending on the duration of the video call, the data is consumed from the 4G data plan. Making WiFi calls is extremely easy. Smartphone users could also find their battery life increased with VoLTE, as without it whenever you make or receive a call your phone has to switch from 4G to 2G or 3G, since 4G calls aren’t supported, and then once the call is finished your phone switches back again. However, it is still important to track your mobile data, and here are some reasons why: Many phones and devices break down the different types of data usage. As detailed in this blog, the increased functionality provided by WiFi gives professionals greater flexibility. This means a 10 minute video call will eat up about 60MB to 80Mb of data. Below you’ll find everything you need to know about VoLTE, including which networks offer it and what’s so good about it. The big advantage of VoLTE is that call quality is superior to 3G or 2G connections, as far more data can be transferred over 4G than 2G or 3G. While 3G and 2G were primarily designed with voice calls in mind and data was added to them. There are some common problems and solutions though, most notably the requirement for Single Radio Voice Call Continuity (SRVCC), which simply means that the phone will be able to switch back to a 2G or 3G signal if you move out of a 4G signal zone during the call. We tend to think of 4G as mostly being about downloading, streaming and web browsing, and indeed that’s primarily what it’s been used for so far, but it can also be used to improve calls, which is why some networks have started offering VoLTE. This allows you to not only make WiFi calls, but also perform other activities, such as stream media but use less data. Then, the economy or coach passengers board next. BT Mobile offers 4G Calling in the same places as EE, so again, it’s widely available, and it works with any iPhone from the iPhone 6 onwards, as well as a number of Android phones. This is why many users end up with data overages. 4G Calling also offers the ability to seamlessly move between that and Wi-Fi Calling, without the call cutting out, so if you move away from one signal type you can continue on the other. Because many different carriers are enabling WiFi calling on various devices, and not counting WiFi calls against data plans, users can easily set their phones and devices to automatically connect with any available WiFi networks when in range. High-definition video uses a lot more data. This allows you to not only make WiFi calls, but also perform other activities, such as stream media but use less data. VoLTE to Wi-Fi Calling: Voice calls will be carried seamlessly across from VoLTE to Wi-Fi Calling without any interruptions or drop-outs. For example, browsing the web at the same time or downloading an app. Once on VoLTE, the call can then in turn drop from LTE to 3G. Active eSIM: Go to Settings > Mobile > Select SIM > Voice & Data. Vodafone also has a VoLTE service called 4G Calling, and it’s available in the same places as its 4G network. If you don't restart your device, HD Calling will activate within four hours. It uses less bandwidth because VoLTE's packet headers are smaller than those of unoptimized VoIP/LTE. After 15 minutes, restart your device to activate HD Calling. Assuming you have a compatible phone, the latest software from your network and are in an area with VoLTE on any of these networks you should have access to VoLTE – it may not be available on all plans though and the availability regularly changes, so if in doubt check with your network. 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