Call from any WiFi.
Anywhere in the world.
Telvio routes your calls over WiFi or mobile data instead of your carrier's network. No roaming plan. No international calling add-on. Just a working internet connection.
What is WiFi calling?
WiFi calling is a technology that routes voice calls over an internet connection instead of through your mobile carrier's cellular network. When you make a WiFi call with Telvio, your voice is converted into data packets, transmitted over WiFi or mobile data, and reconnected as a standard phone call on the other end.
The person you call doesn't need WiFi, an app, or any special setup. They answer their regular landline or mobile phone. From their perspective, it's a normal incoming call.
The practical result: you can call home from a hotel room in Tokyo, a cafe in Berlin, or an airport in Dubai — using the local WiFi — and pay Telvio's flat per-minute rate instead of your carrier's international roaming rate.
100 kbps
Minimum speed needed
Both upload and download
200+
Countries reachable
Landlines and mobiles
None
Carrier involvement
Bypasses your cellular network
$0
Roaming charges
Your carrier can't bill for it
How WiFi calling works
Connect to any network
Join any WiFi — hotel, home, cafe, airport. Or stay on mobile data. Telvio uses whichever internet connection your phone has.
Dial the number
Open Telvio and dial any real phone number with country code. The per-minute rate shows before you connect. No surprises.
They answer normally
Your call routes through Telnyx's carrier-grade network. The recipient's phone rings like any other call. No apps, no internet required on their side.
Where WiFi calling works
Any location with a working internet connection. These are the most common ones.
WiFi calling vs roaming
Requirements
Internet connection
- WiFi — any network
- 4G or 5G mobile data
- Minimum 100 kbps both ways
iPhone requirements
- iOS 15.0 or later
- Any iPhone 6s or newer
- ~30 MB storage
Android requirements
- Android 8.0 (Oreo) or later
- Any modern Android phone
- ~25 MB storage
WiFi calling questions
Does WiFi calling work on hotel WiFi?
Yes. Hotel WiFi works for Telvio calls as long as it has a stable connection with at least 100 kbps upload and download speed. Most hotel networks easily exceed this. If the connection is congested during peak hours, call quality may vary.
What internet speed do I need?
Telvio requires approximately 100 kbps in both directions for a clear call. That is much less than streaming video requires. Most WiFi networks, 4G, and 5G connections comfortably meet this threshold.
Does it work on mobile data, not just WiFi?
Yes. Telvio works over any internet connection — WiFi, 4G, or 5G. The term "WiFi calling" refers to the fact that you can call without using your carrier's cellular voice network at all, not that WiFi is the only option.
Will the call quality be worse than a regular phone call?
On a stable WiFi or 4G connection, call quality is comparable to a regular phone call. Telvio routes calls through Telnyx, a Tier-1 carrier with professional-grade infrastructure. The person you call hears a normal phone call on their end.
Can I make WiFi calls while abroad to avoid roaming?
Yes, that is one of the primary use cases. Connect to any WiFi network abroad — hotel, cafe, airport — and call home at Telvio's flat per-minute rates. Your carrier's roaming charges do not apply because Telvio bypasses the cellular voice network entirely.
Which countries can I call using WiFi?
Telvio covers over 200 countries and territories. You can call landlines and mobile phones in the United States, United Kingdom, Germany, India, Canada, Australia, and many more. The person you call does not need WiFi or any app — they just answer their regular phone.
Call from anywhere. Pay per second.
Download Telvio and test with your included free minute. No roaming plan needed.
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