If you've ever experienced a lack of mobile coverage indoors, in a basement, or in a building with thick walls, you'll be interested to know that Wi-Fi calling is no longer an "experiment": it's a reality with almost all major carriers and increasingly with mobile phone brands. With VoWiFi technology, you can make and receive calls using your wireless connection, and with VoLTE, you keep your voice on 4G without your data connection dropping during the conversation. In both cases, the goal is stable call quality and to eliminate coverage issues, because The voice call is routed using modern networks (WiFi or 4G) instead of relying on 2G/3G.
However, it's not enough for your smartphone to "theoretically" support VoWiFi or VoltaEach operator requires certifications for each model, ensuring the phone integrates the necessary IMS profile and configuration to register on their network. For example, Digi already allows you to talk without mobile coverage thanks to VoWiFi and maintain a data connection during calls with VoLTE, but in addition to having this feature activated on your plan, you must have a phone certified by the company. Digi already has over a hundred certified models from brands like Samsung, Apple, Oppo, Xiaomi, Honor, and Motorola, although it still lacks names like Google, Nothing, Realme, and TCL.Something to keep in mind if you're thinking about changing your mobile phone.
What is VoWiFi and why does it matter?
VoWiFi (Voice over WiFi) allows your phone to make and receive calls using a wireless network instead of relying on conventional radio coverage. It is especially useful indoors, in basements, rural areas, or buildings with poor signal penetration, because Every WiFi network within your reach (for example, Eduroam in universities) acts as an "antenna" for your mobile networkYour number remains the same, you don't need external applications, and voice quality is high if the WiFi is stable.
Furthermore, the technology allows you to receive calls even when there is no mobile coverage and, in many cases, to send and receive SMS messages. Vodafone highlights that its VoWiFi network also supports text messages, which is very useful for two-step verification when there is no cellular signal. Lowi, for its part, indicates that with its VoWiFi you can make and receive calls and send SMS messagesso this functionality is now also reaching more MVNOs.
Keep in mind a couple of practical details: VoWiFi calls don't use up data from your mobile plan, but they do count as voice minutes according to your tariff; and you need your operator to have activated the service on your line and your device to be compatible. If everything is in order, you can talk in HD quality without mobile coverage as long as you have a decent WiFi connection..
What is VoLTE and how does it complement VoWiFi?
VoLTE (Voice over LTE) transmits voice over the 4G network instead of dropping to 2G/3G when you make a call. This prevents data interruptions during conversations and improves quality with HD Voice codecs. Vodafone pioneered VoLTE in Spain by activating it in 2015 and underscores its importance with the gradual shutdown of 3G, with large areas in the center of the country already disconnected. Activating VoLTE on your mobile is usually a requirement to enable VoWiFi and also improves your 4G voice experience with clearer audio.
To give you an idea of the improvement, many carriers use wideband codecs that cover a wider frequency range than traditional narrowband voice. This results in a tangible improvement in clarity and naturalness, especially when speaking with another user who has HD Voice enabled. The VoLTE + VoWiFi combination ensures seamless calls both at home and on the go..
Requirements for using VoWiFi and VoLTE
To use VoWiFi you need three things: a compatible mobile phone, a Wi-Fi network, and a service that your mobile operator offers. Major operators like Vodafone, Movistar, and Orange offer it, as do several of their brands and MVNOs such as Lowi, Digi, O2, and Simyo. Always consult your operator, because they are the ones who activate the service and can help you set up your subscription.
In addition to WiFi coverage, make sure your phone is updated to the latest software version and that the "WiFi Calling" setting is enabled. In many cases, VoLTE must be enabled for VoWiFi to work correctly. Remember: VoWiFi calls count as minutes from your voice plan, not as mobile data..
Regarding Wi-Fi compatibility, you can use virtually any network: your home network, the office network, Eduroam, etc. However, some corporate networks or hotels block certain traffic; if this happens to you, consult with the network administrator. The key is that the WiFi has sufficient bandwidth and stability to maintain the call.
There are specific details depending on the operator. At Jazztel, for example, the WiFi Calling service is free and works like a normal call for billing purposes, but for now it is only available on WiFi in Spain and allows emergency calls using, if necessary, the last location registered on the mobile network. Additionally, the ringback function doesn't work while the call is over WiFi, and its multi-SIM is for data, not voice..
At Digi, in addition to having the VoWiFi/VoLTE option enabled on your mobile device, it's crucial that the device is certified by the operator. Currently, some manufacturers like Google and Nothing are missing, but the certified catalog includes over a hundred models from popular brands. If you intend to use VoWiFi on Digi, first check if your model is approved by the company..
The company has been communicating updates and guides to activate future calls on its lines, and specialized media have compiled these certifications and how to enable them in the settings of each mobile phone. If your team isn't listed yet, it's normal for it to be added over time..
How to activate it on iPhone and Android?
On iPhone, activation is very simple. It depends slightly on the iOS version and carrier, but you usually go to Settings, Cellular, and turn on "Wi-Fi Calling." In some menus, it's also found under Phone. To use VoLTE, go to Settings, Cellular, Options, Voice & Data, and enable VoLTE. If you don't see "WiFi Calling," make sure you have iOS 9.3 or later and the latest carrier update..
Some carriers display an indicator when it's active. For example, on Jazztel, the phone might show "Orange Wi-Fi" on the lock screen when a call is about to be routed over Wi-Fi; the exact location of the setting may vary depending on the iOS version, but activation usually takes a few minutes. If you encounter an error after activating the option, it may be because you have just signed up or changed your mobile phone; temporarily deactivate it and try again after a few days..
- On Android, go to Settings and look for Connections or Mobile Networks.
- At Vodafone, for example, they recommend in Settings > Connections > Mobile networks, selecting “5G/4G/3G/2G network mode (automatic)” and activating VoLTE; for VoWiFi, enable “WiFi Calling” where it appears in your interface.
- On Samsung phones, you can also activate WiFi Calling from the quick settings panel or in Settings > Connections > WiFi Calling.
Remember to activate the service under WiFi coverage so that it is registered correctly..
Carrier compatibility: lists, documents, and nuances
Each carrier certifies specific models. This means that a phone might technically support VoWiFi, but not necessarily work with a carrier if it's not certified. Always check your company's official listings and supporting documents.
Vodafone
Vodafone's network offers VoLTE and VoWiFi and is promoting their use due to the 3G shutdown. They have published an official list of compatible phones with the IMS profile tested to access their server. On iPhones, the typical path is Settings > Cellular > Options > Voice & Data > VoLTE, and for VoWiFi, Settings > Cellular > Wi-Fi Calling. On Android, go to Settings > Connections > Mobile Networks > Auto Network Mode (5G/4G/3G/2G) and enable VoLTE. Vodafone emphasizes that its VoWiFi service allows users to send and receive SMS messages, which is very practical for verifications when there is no mobile signal..
Furthermore, both VoLTE and VoWiFi use HD Voice codecs with better clarity than conventional voice. For a detailed list of models approved by Vodafone, the operator maintains an official document updated as of October 2023. The 3G shutdown is already a reality in many areas, so VoLTE/VoWiFi is not "an extra," but almost essential..
Movistar
Movistar offers VoWiFi so you can make clear calls in areas of your home where the signal is weak. No additional apps are needed; simply use your phone number, and if your Wi-Fi is stable, the improvement is significant. It's an ideal tool for challenging indoor environments and keeps you reachable without relying on 3G/2G coverage..
Orange and Jazztel
Jazztel, which operates on the Orange network, offers WiFi Calling with a very clear and informative guide. It states that all iOS models from the iPhone 5S onward are supported, and provides a list of compatible Android devices accessible from its website. WiFi calls are charged like regular calls (depending on your plan, data allowance, or unlimited plan), do not use up your data allowance, and can be made to any landline or mobile number. At Jazztel, the service is not available on foreign WiFi networks, and SOS calls can be made over WiFi using the last known location if there is no mobile coverage..
Regarding configuration, Jazztel notes that the location of the setting varies depending on the model and version, and that the Wi-Fi Calling icon may appear in the notification bar or on the dialer when the service is active. They also add a caveat: the Ring on Hold service does not work if you are connected using Wi-Fi Calling. If you receive an error when activating it, it may be a matter of hours or days after a new registration or device change; try again later..
Simyo
Simyo provides specific documentation for the devices that support VoLTE/VoWiFi on its network. An official PDF is available with updated details by manufacturer and model. Before buying a mobile phone, check its compatibility document.. You can check it here: Simyo Official Listing (PDF).
Digi
With Digi, you can now make and receive calls over Wi-Fi even without mobile coverage and enjoy HD quality calls on 4G with VoLTE. To take advantage of this feature, you need to activate the options on your phone and, most importantly, check if your model is certified by the company. Digi is expanding its list, with over 100 certified phones from Samsung, Apple, Oppo, Xiaomi, Honor, and Motorola, although manufacturers like Google, Nothing, Realme, and TCL are still missing. If you are a Digi customer, check the list of certified mobiles and activate the feature in Settings..
The company has been communicating updates and guides to activate future calls on its lines, and specialized media have compiled these certifications and how to enable them in the settings of each mobile phone. If your team isn't listed yet, it's normal for it to be added over time..
lowi
Lowi has recently launched its VoWiFi service and is offering it at no extra cost to its customers. The operator explains that with VoWiFi you can make and receive calls and send SMS messages, which is especially useful where mobile coverage is weak. They also recommend activating VoLTE for improved service. Activation depends on whether you use iOS or Android, with very simple menu paths..
According to Lowi, on iOS you go to Settings > Cellular and enable "WiFi Calling"; for VoLTE, go to Options > Voice & Data. On Android, go to Settings > Connections > Mobile Networks and enable Wi-Fi Calling (and 4G Calling for VoLTE). The list of compatible phones will expand over time; for now, Lowi publishes a broad list by brand and model. Lowi indicates that Samsung models must be updated to Android 15..
Models compatible with VoWiFi on Lowi (list provided by the operator)
Apple: recent iPhone models and several previous generations.
- iPhone SE 2 and iPhone SE 3
- iPhone X and iPhone XR
- iPhone XS and iPhone XS Max
- iPhone 11, 11 Pro and 11 Pro Max
- iPhone 12, 12 mini, 12 Pro and 12 Pro Max
- iPhone 13, 13 mini, 13 Pro and 13 Pro Max
- iPhone 14, 14 Plus, 14 Pro and 14 Pro Max
- iPhone 15, 15 Plus, 15 Pro and 15 Pro Max
- iPhone 16, 16 Plus, 16 Pro, and 16 Pro Max and later
- iPhone 16e
Samsung S Series: S21 to S25 families and FE variants.
- Samsung S25, S25+ and S25 Ultra
- Samsung S24FE
- Samsung S24, S24+ and S24 Ultra
- Samsung S23, S23+ and S23 Ultra
- Samsung S23FE
- Samsung S22, S22+ and S22 Ultra
- Samsung S21FE 5G
- Samsung S21, S21+ and S21 Ultra 5G
Samsung A: wide range A with 4G and 5G.
- Samsung A56
- Samsung A26
- Samsung A16 and A16 5G
- Samsung A55 5G
- Samsung A15 and A15 5G
- Samsung A25 5G
- Samsung A54 5G
- Samsung A24
- Samsung A34 5G
- Samsung A53 5G
- Samsung A33 5G
- Samsung A14 and A14 5G
- Samsung A05s
- Samsung Galaxy A17 5G
Samsung Tab tablets and others: tablets and foldables.
- Samsung Tab Active5
- Samsung Tab S10 Ultra
- Samsung Tab S9, S9+ and S9 Ultra
- Samsung Tab A9
- Samsung Tab S8, S8+ and S8 Ultra
- Samsung Tab Active4 Pro
- Samsung Tab S6 Lite
- Samsung Fold 6 / Flip 6
- Samsung XCover7
- Samsung Z Fold5
- Samsung Z Flip5
- Samsung M53 5G
- Samsung Z Flip3 5G
- Samsung Z Fold3 5G
- Samsung M33 5G
Xiaomi and Redmi: Note series, T series and 15 range.
- Redmi Note 13 5G
- Xiaomi 14T Pro 5G
- Xiaomi 14T 5G
- Redmi Notes 14 Pro 5G
- Redmi Note 14 5G
- Xiaomi 15t pro
- Redmi Note 14
- Xiaomi 17 (TBD)
- Redmi 15C 5G
- Xiaomi 15t
- Redmi Note 15 5G
- Redmi Note 15 Pro + 5G
- Redmi Notes 15 Pro 5G
- Xiaomi 15
Honor: folding and 200 range.
- Honor Magic V2
- Honor Magic V3
- Honor 200 Smart 5G
- Honor Magic V5
Oppo: Reno series.
- Oppo Reno 12 FS
ZTE: Blade A.
- ZTE Blade A35
- ZTE Blade A55
- ZTE Blade A75
Motorola: Edge, Moto and Razr.
- Motorola Edge 50 neo
- Motorola Moto G55 5G
- Motorola Moto G75 5G
- moto g05
- motorola razr 60 ultra
- motorola edge 60 pro
- motorola edge 60
TLC: NXTPAPER and 50 series.
- TCL 50 Pro NXTPAPER 5G
- TCL50 5G
- TCL 40 NXTPAPER 5G
Lowi indicates that it will continue adding more devices and acknowledges that many users are waiting for the inclusion of Google Pixel and other manufacturers. In the meantime, you can occasionally check if your phone is now supported after an update. The positive news is that the operator confirms that "they are working on it" and their list is already long..
Privacy and data management (corporate information provided)
If you register to receive commercial or service information, please remember that the data you provide will be part of a database of Vodafone España, SAU, with registered office at Avda. América 115, 28042 Madrid, and will be processed to offer you the requested information.
You can exercise your rights of access, rectification, cancellation, opposition and limitation by sending a written request with a photocopy of your ID to Lowi with the reference "Customer Service Department (Data Protection) Lowi", to Avenida de América, 115, 28042, Madrid, or via email requests@lowi.es.
Usage tips, costs and quality
VoWiFi calls are usually included at no extra cost on your line, but are charged "like a normal call" according to your plan: if you have a minutes bundle, they'll be deducted from it, and if you have unlimited minutes, they'll also be unlimited over Wi-Fi. For international calls or calls to premium-rate numbers, the same rules apply as for a traditional mobile call. Under no circumstances will they use up your data allowance.
Compared to apps like WhatsApp or Viber, the operator's Wi-Fi Calling service guarantees quality (network permitting) and works with any destination without requiring the recipient to use the same app. Furthermore, with VoLTE, voice travels as VoIP over 4G with guaranteed quality, whereas OTT apps do not offer this guarantee. The voice is encrypted on the operator's network, with the same level of security as a regular mobile call..
If your Wi-Fi network is corporate or public, the administrator might have blocked certain ports or protocols, which could affect call setup. In that case, you'll have no choice but to contact IT or switch networks. The real requirement is to have enough bandwidth and stability to maintain an uninterrupted conversation..
Official documentation and resources
For more information, it's advisable to check each operator's website and their compatibility and activation documents. Here are some reference resources that have been cited or mentioned: They are useful for checking lists and exact steps according to your model.
- List of devices with VoLTE/VoWiFi at Simyo: Download pdf
- Vodafone announcements and guides on VoLTE/VoWiFi and its official list of compatible devices (updated to October 2023).
- Jazztel's guide to WiFi Calling with iOS and Android, compatibility and frequently asked questions.
- Digi's information on mobile certification and VoWiFi/VoLTE activation on its lines, with Google, Nothing, Realme or TCL still absent.
The current landscape makes it clear that VoWiFi and VoLTE have gone from being features "for experts" to everyday solutions: they improve indoor coverage, avoid dependence on 3G as it is being phased out, and even allow the use of SMS without a mobile signal on networks that support it.
If you check your mobile's compatibility with your carrier, update the software, and activate the options in Settings, you'll have stable, high-quality calls wherever your WiFi reaches. Share this guide and more users will learn all about VoWiFi technology.