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What is Wi-Fi calling, and should you turn it on?

By Roof & Router Team. Updated November 1, 2026.

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What is Wi-Fi calling?

Wi-Fi calling lets your phone make and receive regular calls and texts over a Wi-Fi connection instead of a cell tower. AT&T describes it as letting “your phone make calls and texts using a Wi-Fi network, instead of your provider’s cellular network.” Verizon also calls it Voice over Wi-Fi (VoWiFi) and says it covers voice calls, texts and video calls.

Three things make it different from a calling app:

• It uses your phone’s own dialer. You call from the normal Phone app, with your contacts.
• The other person needs nothing special. You can call any phone number.
• Your carrier runs it. It is a carrier feature, so your carrier has to support it. Google notes that “not all carriers support calls over Wi-Fi,” and if the setting is missing, your carrier does not offer it.

You can tell it is working by the label. On an iPhone, Apple says “Wi-Fi” appears in the status bar when you open Control Center. AT&T iPhones show “AT&T Wi-Fi,” and on AT&T Android phones a plus sign (+) appears. Google’s Phone app shows “Internet Call” or “Wi-Fi calling” in the notification.

Should I turn Wi-Fi calling on?

Our take: for most people, yes. It costs nothing extra to U.S. numbers on Verizon, AT&T and T-Mobile unlimited plans, and it is a cheap fix for bad indoor reception. Verizon says it “may improve indoor call quality.”

It helps most if:

• Your cell signal is weak at home, in a basement, or in a building with thick walls or metal roofing.
• Your Wi-Fi is solid in the rooms where calls drop.
• You travel abroad and want to call U.S. numbers without roaming charges.

It helps less, or needs care, if:

• Your home internet is slow or unreliable. A bad connection means bad calls.
• You move often and forget to update your emergency address (see the 911 section below).
• You are abroad and a call slips back to cellular. T-Mobile warns this can cause unexpected roaming charges.

Turning it on does not mean every call goes over Wi-Fi. Samsung explains that if your preferred network is not available, “the alternative will be used automatically.” AT&T says Wi-Fi is used “when cellular coverage isn’t available.”

Does Wi-Fi calling cost extra or use data?

For calls to U.S. numbers, there is no extra charge on Verizon and AT&T, or on T-Mobile unlimited plans:

Data works differently from a normal call:

• It uses your Wi-Fi internet, not cellular data. T-Mobile says “data usage over Wi-Fi doesn’t use the T-Mobile network,” and Verizon says calls and texts to U.S. numbers don’t count against your plan’s data allowance.
• The data is small. Verizon says a voice call uses about 1-5 MB of data, and a 1-minute video call typically uses 6-30 MB depending on video resolution.
• Texts still count as texts. AT&T says texts over Wi-Fi are billed under your rate plan like regular texts.
• Watch for paid networks. Verizon notes the Wi-Fi network itself “may charge an access fee,” such as some hotel or airline Wi-Fi.
• Special numbers cost money. AT&T bills 411 and other special service numbers at standard premium rates.

How do I turn on Wi-Fi calling?

Connect to Wi-Fi first. Then follow the steps for your phone. Menu names can vary a little by carrier and software version.

iPhone (Apple Support):

1. Open Settings and tap Cellular.
2. If you have more than one line, choose the line.
3. Tap Wi-Fi Calling and turn on Wi-Fi Calling on This iPhone.
4. Tap Enable. You may need to enter or confirm your address for emergency services.

Verizon adds that an iPhone must be connected to the Verizon network in the U.S. to turn it on. It “can’t be activated after you leave the country,” so set it up before you travel.

Samsung Galaxy (Samsung US Support):

1. Open Settings, tap Connections, then Wi-Fi Calling.
2. Turn the switch on. If asked, enter your emergency address and tap Save.
3. Use Calling Preference to choose Wi-Fi or cellular as the preferred network.

Samsung says you must be on Wi-Fi with active service on a SIM or eSIM, and that on AT&T phones, VoLTE must be on first.

Google Pixel and other Android phones (Google Phone app Help):

1. Open Settings.
2. Tap Network & internet, then SIMs, then your carrier SIM, then Wi-Fi calling.
3. Turn Wi-Fi calling on.

On other Android phones, Verizon suggests searching Settings for “Wi-Fi Calling,” which is often under Call Settings. Verizon requires HD Voice to be on, which it says is the default on its current smartphones, and AT&T requires an account set up for HD Voice.

Using an iPad, Mac or Apple Watch: Apple lets you add these under Cellular > Wi-Fi Calling > Calls on Other Devices if your carrier supports Wi-Fi calling on iCloud-connected devices. Apple Watch gets Wi-Fi calling automatically once you allow calls on other devices.

Does Wi-Fi calling work with weak cell signal at home?

Yes. That is the main reason it exists. If your phone has one bar or none indoors but your Wi-Fi is good, the call goes over your internet connection instead.

The catch is that the call is only as good as the Wi-Fi where you stand. Verizon says Wi-Fi calling relies on your wireless internet connection’s signal and bandwidth. If calls break up in one room, the problem is often Wi-Fi coverage, not your carrier. Moving the router helps first; see where to place your Wi-Fi router. For slowdowns with other causes, see why is my Wi-Fi slow.

AT&T also suggests letting your phone keep Wi-Fi on during sleep mode, if it has that setting, so you don’t miss incoming calls.

What about 911 and my emergency address?

When you turn on Wi-Fi calling, your carrier asks for a U.S. street address. This is the E911 address (Enhanced 911): the location sent to the 911 center if your phone cannot report where you are.

Why it matters:

• The FCC requires it. Under FCC rules, internet calling providers must “obtain a customer’s physical location prior to service activation.” Verizon says it is required by the FCC to collect a registered location to enable the service.
• Cellular is tried first. Apple says your iPhone uses cellular for emergency calls when it is available. Verizon says 911 calls “always try cellular service first, even when your device is in Airplane Mode or cellular service is off.” AT&T also uses cellular when possible.
• Wi-Fi 911 can use the address you typed. Verizon says that if cellular isn’t available, the call “routes using the registered address,” and if you are not there, it “may not be routed to the closest emergency service provider.”
• A Wi-Fi drop ends the call. AT&T says a 911 call disconnects if the Wi-Fi connection drops.

What to do:

1. Enter the address where you use Wi-Fi calling most, usually home.
2. Update it whenever you move or use Wi-Fi calling somewhere else for a while. T-Mobile requires this. On a Galaxy, it is under Wi-Fi Calling > Emergency Address. On AT&T, change it on the same screen where you turned Wi-Fi calling on.
3. Tell babysitters and guests about the limits, as the FCC suggests for any internet-based phone service.

Can I make international calls over Wi-Fi?

Yes, but the rules depend on who you call and where you are. The short version:

• Calling U.S. numbers while abroad is free over Wi-Fi on Verizon and AT&T. On T-Mobile, outgoing calls to U.S. numbers have no fees on unlimited plans.
• Calling non-U.S. numbers while abroad is billed by plan. AT&T includes these Wi-Fi calls in its International Day Pass fee for 210+ destinations, and bills them at the Passport per-minute rate on Passport. Without an add-on, AT&T charges per minute based on the country you are in. Verizon bills them at international long distance or pay-as-you-go rates, and plays a voice prompt warning that charges may apply.
• Calling other countries from inside the U.S. over Wi-Fi costs the same as a normal international call on all three carriers.
• Toll-free numbers (800, 888) often won’t complete from abroad, AT&T says, and are billed as international calls if they do.

Some countries block it. AT&T lists Wi-Fi calling as unavailable in China, Cuba, North Korea, India, Iran, Israel, Pakistan, Saudi Arabia, Sudan, Syria, Turkey, the UAE and Vietnam. T-Mobile names North Korea, Iran and Syria among countries where it is prohibited by law. T-Mobile also warns that using a VPN can trigger international rates, even in the U.S.

To avoid surprise roaming charges, T-Mobile suggests turning on Airplane mode, then turning Wi-Fi and Wi-Fi calling back on, turning off data roaming, and checking for the Wi-Fi calling icon before each call.

How much internet speed does Wi-Fi calling need?

Very little. T-Mobile lists a minimum of 2 Mbps for both upload and download. Verizon and AT&T don’t give a number. AT&T says calls rely on a “strong and stable internet connection,” and Verizon says the feature relies on your connection’s signal and bandwidth.

Our math on Verizon’s video figure: 30 MB a minute is 30 × 8 = 240 megabits ÷ 60 seconds = 4 Mbps at the top end, so HD video calls need more than voice. Almost any wired home plan covers a voice call. The bigger risk is everything else on the network at the same moment. For sizing a plan around calls, streaming and gaming, see how much internet speed do I need.

T-Mobile does not support Wi-Fi calling over satellite internet or a cell phone hotspot.

Wi-Fi calling vs. WhatsApp and FaceTime: what’s the difference?

AT&T notes that built-in Wi-Fi calling works with your phone book and the other person needs no extra app, while most apps “only allow calls and texts between users who have downloaded the app.” AT&T also warns that these apps can use cellular data for calls and texts if Wi-Fi is weak and you have an active cellular plan.

Our take: FaceTime belongs with the apps here, not with carrier Wi-Fi calling. Use Wi-Fi calling for everyday calls and anything official, and apps for free calls to friends abroad who already use them.

Does Wi-Fi calling work during a power outage?

Only if your internet stays up. Your phone has a battery, but your modem and router do not. The FCC warns that “if your power is out or your internet connection is down,” internet-based (VoIP) calling may not work, and suggests a backup power supply or a wireless phone as a backup.

In an outage, your phone will fall back to cellular if a tower is in range. If Wi-Fi calling is your only reliable signal at home, a small UPS (uninterruptible power supply) on the modem and router keeps it working through short outages, as long as your internet provider’s own equipment also has power. A modem and router together draw only a small load; see what size UPS battery backup you need for sizing and runtime. Those boxes run around the clock, which is covered in standby power and phantom load.

The FCC and FEMA also advise charging your phone before a storm and limiting non-emergency calls.