What is Wi-Fi Calling and what are its benefits?
You can be reached even where a regular signal doesn't reach. Wi-Fi calling means you can make calls even from places where there is no mobile signal, provided you have a Wi-Fi connection.
What are the main benefits of Wi-Fi calling?
- Friends can reach you on your standard phone number. Similarly, you can call regular numbers from your contact list.
- Wi-Fi Calling can be used at home and abroad.
- You will enjoy high call quality with HD Voice. The resulting quality of a call over Wi-Fi depends on the strength of the Wi-Fi signal and the connection parameters of the given provider.
- When voice isn't enough, you can add video to your call. This feature may not be supported by all phones.
- Even though it’s Wi-Fi calling, SMS and MMS will also work for you.
What do I need for Wi-Fi Calling?
A phone that supports Wi-Fi Calling.
You can find the list of phones in this document. For some models, Wi-Fi calling functionality is conditional on being purchased from Vodafone. To ensure Wi-Fi Calling works correctly, you need to have the latest firmware on your phone that enables the feature.
An active service.
To make everything work, you need to have the Wi-Fi Calling service turned on both in your phone settings and for your number. The Wi-Fi Calling service is usually active on your phone number by default; you can verify this in the My Vodafone Self Care portal on our website under the Services section.
Wi-Fi Calling isn't working for me. What could be the cause?
- Check for the latest firmware: Ensure you have the latest software update installed with Wi-Fi Calling support.
- LTE SIM card: You need an LTE SIM or eSIM for Wi-Fi Calling. If you don't have one yet, contact us and we will be happy to help.
- Active service VoLTE and Wi-Fi Calling: Verify this in the My Vodafone Self Care portal on our website under the Services section. If the service is not active, please contact us and we will be happy to help.
- Phone settings: Wi-Fi Calling must be enabled in your phone's settings menu.
- Wi-Fi network parameters: The network you are trying to connect to might not meet the required parameters. You can verify them below.
Will I pay anything extra for Wi-Fi Calling? How does it work abroad?
Calls (including video calls), SMS, and MMS are charged at the same rate as if you were calling from a regular mobile network in the Czech Republic.
If you use Wi-Fi Calling abroad:
| When using Wi-Fi Calling abroad | How we charge for services |
|---|---|
| Outgoing call, SMS, or MMS to a CZ number | Charged at standard domestic (CZ) rates |
| Outgoing call, SMS, or MMS to a foreign number | Charged as an international call from the CZ to abroad |
| Incoming call, SMS, or MMS | Free of charge |
Because Wi-Fi Calling abroad works as if you were still in the Czech Republic, we recommend always dialing numbers in the international format. You can reach Czech numbers without the +420 prefix, but the international format ensures connectivity. You do not need to have Roaming active to use Wi-Fi Calling.
Do both parties need to have Wi-Fi Calling active?
No. You will be able to hear the other party even if they are using an older feature phone. However, mutual support is necessary to enjoy certain benefits:
- HD Voice: You will hear each other more clearly if you call within the Vodafone network and both parties have a phone that supports HD Voice. HD Voice is available across our entire network.
- Video Call: You can add video to your call if you are calling within the Vodafone network and both parties are using Wi-Fi Calling or VoLTE.
How can I tell on my phone that I am using Wi-Fi Calling?
Android
You can see that you are currently using Wi-Fi Calling:
- In the notification list, you will see the "Vodafone WiFi volani" notification.
- In the status bar, you will see a phone handset icon with a Wi-Fi symbol.
- In the call log, calls made via Wi-Fi will have a Wi-Fi signal icon next to them.
- To toggle the service: Open the Dialer — More — Settings — Wi-Fi Calling (steps may vary by model).
iPhone
- You are using Wi-Fi Calling if you see "Wi-Fi" next to the operator's name in the status bar.
- To toggle the service: Go to Settings — Applications — Phone — Wi-Fi Calls.
What happens if I lose the Wi-Fi signal?
The call will seamlessly continue on the LTE network via VoLTE (available only within the CZ). Handover to a 2G network is not technically possible.
Is Wi-Fi Calling secure?
Absolutely. Wi-Fi Calling is just as secure as calling through our standard mobile network. Authorization to use the service is encrypted and depends on the presence of your SIM card.
Can I use any Wi-Fi network for Wi-Fi Calling?
Wi-Fi Calling is supported by any Wi-Fi network you sign into, provided its download and upload speeds are at least 100 kbps for voice and 1 Mbps for video calls. To ensure the call works correctly, the Wi-Fi router must support IPsec and meet these parameters:
- IP Protocol Type=ESP 50 and/or IP Protocol Type=UDP (Port=500)
- IP Protocol Type=UDP (Port=4500)
- NAT translation timeout set below 2 minutes.
Can I use emergency calls with Wi-Fi Calling?
Yes, you can reach emergency lines 112, 150, 155, and 158 even when using Wi-Fi Calling.
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