- VoLTE and VoWiFi use the data channel (4G/5G or WiFi) to improve call quality, connection speed, and coverage.
- Most major operators in Spain offer VoLTE, and a smaller group also allows voice over WiFi at the same rate as a normal call.
- A compatible mobile phone, updated software, and activation of 4G and WiFi calling options in the Android or iPhone settings are essential.
- Calls remain secure and at no extra cost, and are especially useful indoors, in basements, and in areas with poor mobile coverage.
If you have an Android phone and you've heard of VoLTE, Wi-Fi calling, or 4G Voice , but you're not quite sure what it is or how to activate it, you've come to the right place. In recent years, carriers have been quietly rolling out these features, but they make a huge difference in the quality and coverage of your calls , especially now that 3G is being phased out.
Beyond the technical jargon, we're talking about your phone being able to take advantage of both the 4G/5G network and your home, work, or university Wi-Fi so you can make and receive calls with better sound quality and fewer dropouts , even when you have poor mobile coverage. Let's take a closer look at what VoLTE and VoWiFi are, which carriers offer them, what you need, and how to activate them on Android (and also on iPhones, which you probably have nearby).
What are VoLTE and VoWiFi and how do they differ?
The starting point is understanding that, with these technologies, calls no longer use the traditional voice channel of the mobile network but instead use the data channel . In other words, your conversation no longer travels over the old 2G or 3G networks like a regular phone call, but rather as data over 4G/5G or Wi-Fi, even though you're still making the call from your regular phone app and using your same number.
When the call goes over the mobile data network, it's called VoLTE (Voice over LTE) , and when the call uses the wireless connection at home, the office, or the university, it's called VoWiFi (Voice over WiFi) . In both cases, the key is that everything is encapsulated as IP traffic using the IMS (IP Multimedia Subsystem) , which handles security, audio compression, and compatibility with services like voicemail, emergency calls, and caller ID.
In a conventional call, your voice travels over the mobile network (3G, 4G, or 5G) using the traditional voice channel, while with VoLTE and VoWiFi, the voice is digitized and sent as data packets over the 4G/5G or Wi-Fi network to the operator's infrastructure. From your perspective, there's hardly any difference: you dial a number and speak as usual, but the audio is typically much clearer, connection time is reduced, and, in the case of VoWiFi, you can even talk without mobile coverage as long as you have a good Wi-Fi connection.
VoLTE and VoWiFi are designed to complement each other: your phone can switch between VoWiFi and VoLTE during a call (if your carrier supports it) depending on which connection is best, in order to maintain a stable and uninterrupted connection. Ideally, this should be completely transparent to you: you won't even notice where the call is being routed.
Real advantages of VoLTE and VoWiFi
Operators have long boasted about VoLTE and VoWiFi because they offer several clear improvements over traditional calls , both when you're out with 4G/5G and when you're locked in a basement with WiFi but no coverage.
The first and most noticeable advantage is the high-definition sound quality . VoLTE and VoWiFi typically use wideband voice codecs (HD Voice) that allow for a wider frequency range than older calls, reduce background noise, and provide a more natural voice, as if the other person were right next to you. This is especially appreciated indoors where mobile coverage is weak and analog calls sound choppy.
Another obvious improvement is the time it takes to establish a call . With 2G/3G networks, it was common for there to be a small delay between pressing the call button and the ringtone at the other end; with VoLTE, this delay is greatly reduced, and connections are almost instantaneous, giving a feeling of greater responsiveness when using the mobile phone.
VoLTE also offers a key advantage: the ability to use data and voice simultaneously without sacrificing speed . When your mobile network drops to 3G for calls, data performance plummets, and browsing or using social media while talking can be a nightmare. With VoLTE, you stay on 4G/5G, so you can continue browsing, watching videos, or using instant messaging while on a call without experiencing significant slowdowns.
There's also a direct impact on available coverage . VoLTE leverages the 4G (and 5G) network for calls, which is helpful in areas where 2G/3G is almost nonexistent or where the older network is poor—especially important now that operators are gradually phasing out 3G. VoWiFi, on the other hand, comes to the rescue in places where mobile signal is practically nonexistent but Wi-Fi is strong : building interiors with thick walls, basements, rural houses, indoor offices, or university campuses with good wireless networks.
In terms of power consumption, many operators highlight that VoLTE can optimize battery usage compared to 2G/3G calls, since the phone doesn't have to constantly switch between network technologies. Furthermore, VoWiFi calls help offload the mobile network in congested areas, improving the overall experience for all users connected to the same operator in that area.
And something that often causes concern: the cost of VoLTE and VoWiFi calls . In current Spanish plans, these calls are billed exactly the same as a regular voice call on your plan. There are no surcharges for using VoLTE or VoWiFi; if you have a minutes bundle, they are deducted from it, and if your contract includes unlimited calls, they are also unlimited over 4G and Wi-Fi. They usually appear on bills as regular calls, and international calls or calls to special numbers are charged according to the plan's standard rates. With VoWiFi, although the traffic travels as data, it is not deducted from your mobile data allowance because it uses the Wi-Fi network, not the mobile connection.
Operators that offer VoLTE and VoWiFi in Spain
In Spain, most major operators and quite a few MVNOs have already activated these technologies, although not all offer VoWiFi and VoLTE under the same conditions or for all customers equally.
Regarding VoLTE, this service is offered by Movistar, O2, Vodafone, Lowi, Orange, Jazztel, Simyo, Yoigo, MásMóvil, Pepephone, Digi, and Finetwork , among others. With these companies, you can make and receive high-quality calls using your 4G data connection (and in some cases, 5G) without your mobile network dropping to 3G or 2G during the call. This is especially relevant with the gradual phasing out of 3G, as it ensures that calls remain possible with good quality over 4G.
In VoWiFi, the group is somewhat smaller: Movistar, O2, Vodafone, Orange, Jazztel, Simyo, and Digi currently allow you to make voice calls over Wi-Fi using your phone number and the usual calling app. In several of these cases, the functionality is limited to contract lines and is not available on prepaid plans , so it's advisable to check the specific terms of your plan.
Besides the major brands, smaller mobile virtual network operators ( MVNOs) have also added VoLTE and VoWiFi, such as Wifitech, Xenet, tumovil, and Lemmon. Here's an important detail: these MVNOs depend on the wholesale network they use . For example, you might be able to use VoLTE and VoWiFi with one of these operators under Movistar coverage, but the behavior will change when your phone connects to another provider's network, such as Vodafone or Orange, depending on their respective agreements.
In specific environments such as universities or large organizations, it is emphasized that VoWiFi is compatible with corporate or academic WiFi networks (e.g., Eduroam), provided the mobile network operator allows the use of this technology. In these scenarios, the surrounding WiFi networks effectively function as additional antennas for the mobile network , significantly improving coverage indoors, in buildings with thick walls, basements, or rural areas with poor signal.
Requirements for using VoLTE and VoWiFi
To take full advantage of all this, it's not enough for your carrier to offer it; you need to meet several basic network, device, and configuration requirements . If one of these fails, you may not see the VoLTE or VoWiFi icons even if your carrier has them enabled.
First, you need a mobile line with a carrier that supports VoLTE and/or VoWiFi . In some cases, the service is activated by default, and in others, you need to request activation from your carrier (especially with older plans or business accounts). Additionally, the line must be configured to use mobile data over 4G or 5G, not just 3G.
The second point is having a compatible and up-to-date mobile phone . Most current smartphones include support for VoLTE and VoWiFi, but actual compatibility depends on two things: the operating system version and whether the model is certified by the carrier. On iPhones, for example, models from the iPhone 8 onward with iOS 16.4 or higher are compatible with VoLTE and VoWiFi on networks that support it. On Android, the standard is usually phones with Android 9 or Android 10 and later, although some earlier models already supported it.
Operators like Orange publish lists of devices approved for VoLTE and VoWiFi , indicating which models have been officially tested and certified for the service. If your phone isn't on that list, it's possible that, even if technically capable, the feature won't appear in the settings or won't work correctly until the manufacturer and the operator validate it.
In addition to the model, it's important that your phone has the latest available version of Android installed and that, in the network settings, the preferred network type is set to "5G/4G/3G/2G (automatic)" or similar. If you force it to use only 3G or 2G, VoLTE won't work and data usage will be severely limited.
In the specific case of VoWiFi, you obviously need access to a stable Wi-Fi network with good coverage . The carriers themselves recommend using Wi-Fi calling only when mobile coverage is poor or nonexistent, precisely to avoid problems if the wireless network is unstable. If you have Wi-Fi Voice active and your router or local network is unreliable, you risk losing audio or having the call dropped mid-call.
How to activate VoLTE and VoWiFi on Android
Activation on Android may vary slightly depending on the manufacturer and customization layer, but generally speaking, the steps to turn on VoLTE and WiFi calling are quite similar on almost all recent models.
To get started with VoLTE, it's best to make sure your phone is updated to the latest Android version available for your model. Then, on many devices, you'll need to go to "Settings" and then to "Networks & Internet" or "Connections." From there, go to "Mobile network" or "Internet," select your carrier, and enable the "4G Calls" or "VoLTE Calls" option. On other Android interfaces, the path might look more like "Settings > Connections > Mobile networks > 5G/4G/3G/2G network mode (automatic connection)," and within that menu, enable a specific VoLTE switch if available.
On devices running Android 10 or higher, you'll usually find a "VoLTE" option or toggle within the network settings. For Android 9, the path might include an advanced submenu, such as: "Settings > Network & Internet > Mobile network > Advanced > Preferred network type > 4G or higher," where you can then enable the VoLTE switch. Additionally, on Samsung phones with One UI, you'll often see a "VoLTE" icon next to the signal strength indicator when the service is active and available.
To activate Wi-Fi calling (VoWiFi) on Android, the steps are also simple if your carrier supports it. You'll usually need to open "Settings," go to "Network & Internet" (or "Connections"), and look for the "Wi-Fi Calling" or "VoWiFi Calling" section. Once there, simply activate the corresponding option. On some phones, the setting is located within the "Phone" app, under "Settings > Calls > Wi-Fi Calling." Samsung, for example, places a quick "Wi-Fi Calling" icon in the quick settings bar, and you can activate or deactivate it from "Settings > Connections > Wi-Fi Calling."
When VoWiFi is active and your phone connects to a valid Wi-Fi network, a headset icon with a Wi-Fi symbol or a label such as "VoWiFi," "Wi-Fi Calling," or even the operator's name followed by "Wi-Fi" (for example, "Orange Wi-Fi" or "Orange Wi-Fi Calling") usually appears in the status bar. This indicates that, from that moment on, your calls and SMS messages can be routed over that wireless network whenever mobile coverage is poor or the operator prioritizes voice over Wi-Fi.
How to activate VoLTE and VoWiFi on iPhone?
Although the focus is on Android, many users combine an iPhone with lines that also use VoLTE and VoWiFi , so it's useful to know where the option is in iOS to be able to compare or help someone close to you.
For VoLTE on iPhone, you need to go to “Settings > Cellular > Cellular Options > Voice & Data” . On newer models, you can directly select “5G Auto” or a mode that includes both 4G and VoLTE. On models prior to iPhone 12, you need to have the “4G” option enabled and then specifically activate the “VoLTE” switch within it. This will ensure that calls are routed over the 4G network whenever your carrier supports it.
To use Wi-Fi calling on your iPhone , go to Settings > Cellular > Wi-Fi Calling. There you'll see the option "Wi-Fi Calling on This iPhone," which you need to turn on. When you do this, Apple displays a warning message indicating that when you connect to a network, the country from which the call is being made, your mobile carrier's identifier, and, in some cases, the city or town for short code calls, may be sent to the carrier for proper service management and emergency assistance. If you accept and tap "Turn On," your iPhone will start using Wi-Fi for your calls when appropriate.
Advanced compatibility and tips on Android
In some cases, your Android phone may technically support VoLTE and VoWiFi, but the options may not appear in the settings because the carrier hasn't certified them or the custom interface hides them. For advanced users, it's possible to enable these features using tools like Shizuku and specific apps, although this is a more technical process and not recommended if you're not familiar with what you're doing.
The procedure that has become popular on phones with Android 11 or higher (and skins close to stock Android/AOSP) involves enabling developer options , installing the Shizuku app, enabling wireless debugging and disabling permission monitoring, pairing the device with a sync code, and, once the Shizuku service is running, installing an app like Pixel IMS that forces the VoLTE and VoWiFi options to appear in the system. After checking the corresponding boxes in that app, the 4G and Wi-Fi calling switches should appear within "Settings > Mobile networks" or its equivalent.
These types of solutions allow you to enable VoLTE and VoWiFi on non- officially certified mobile phones, provided the carrier supports these technologies on the line. However, modifying these settings involves some risk, requires a degree of experience, and, if not done correctly, can lead to unexpected network behavior. Therefore, it's an option intended for advanced users willing to experiment, not for those who simply want a stable, straightforward solution.
Usage, security, and billing considerations
There are several practical details worth knowing before leaving VoWiFi and VoLTE always active. In the case of Voice over Wi-Fi, operators clearly state that the service is only available over Wi-Fi networks within Spain ; if you travel abroad, you cannot use Wi-Fi Voice as a substitute for traditional roaming, even if you are connected to a wireless network in another country. It also does not apply to networks of other operators outside of Spain.
Another common recommendation is to use Wi-Fi Voice only when mobile coverage is poor or nonexistent. The reason is that if you have a decent mobile signal but an unstable Wi-Fi connection, your phone will prioritize Wi-Fi calling (if configured to do so), which can worsen the experience: audio cutouts, interruptions, or dropped calls. If you notice these kinds of problems, a quick fix is to temporarily disable Wi-Fi Calling in your phone's settings menu.
Regarding security, the companies state that VoWiFi and VoLTE calls are encrypted and just as secure on Android as those made over traditional mobile networks. By adhering to operator and IMS subsystem standards, call signaling and content are protected against eavesdropping in the same way as on standard 4G/5G networks.
Regarding billing, VoLTE and VoWiFi calls are billed the same as any other call on your plan: if you have a minutes bundle, they will be deducted from it; if you have unlimited calls, you can make unlimited calls on both 4G and Wi-Fi voice. International calls maintain their standard rates or use up any included international bundles. Premium rate numbers are billed the same as if you were calling over mobile coverage. In no case will data be deducted from your mobile data allowance for calls made using Wi-Fi.
In emergency situations, your phone will first attempt to use the mobile network for calls to 112 , and only if there is no coverage will it resort to Voice over Wi-Fi. In that situation, the system usually uses the last location recorded on the mobile network to associate it with the emergency call, so that the services can locate you more easily, even if you are calling through an indoor Wi-Fi network.
Finally, there are advanced services like call forwarding that depend on both the carrier's network and the device's own support. If your phone already allowed call forwarding over 3G, you can usually continue to do so over 4G Voice, although some very specific features (like blind transfers) may not yet be available over VoLTE. You always have the option to disable 4G or VoWiFi calling from the settings menu if you find that a corporate service isn't working as expected.
With all this, VoLTE and VoWiFi have become two key components for maintaining good call quality at a time when 3G networks are disappearing and we're becoming almost entirely dependent on 4G, 5G, and local Wi-Fi. If you also choose a carrier that supports them and a compatible phone, configuring these features on your Android or iPhone will allow you to have better sound quality, make better use of your data, and stay reachable even in buildings with poor signal or areas with weak coverage. Share this information so more people can learn about it.