Can You Use Wi-Fi Calling Without a SIM Card? No. Here's How to Call Anyway

Short answer: no, Wi-Fi Calling does not work without a SIM card, and it isn't supposed to. Wi-Fi Calling is your carrier's phone service sent over Wi-Fi instead of over a cell tower, which means it's still the carrier's line, still your number, still your plan, and still something the carrier has to be able to bill. The SIM, or the eSIM, is how the carrier knows the call is yours and bills it to your plan. Take the SIM out and the carrier has nobody to bill. The switch disappears, or does nothing.

That doesn't mean a phone with no SIM can't make calls. It can. Three ways. It can call other people inside an app they also have, like WhatsApp or FaceTime. It can call any ordinary phone number, landline or mobile, through an internet calling service that charges by the minute. And in the United States it can call 911 with no SIM at all, because federal rules say carriers must connect every wireless 911 call whether or not the phone has an account.

The rest of this page is the detail: why the carrier feature needs a SIM, what "no SIM", "no service" and "no recharge" each actually mean, how to dial a real number from a SIM-less phone, a tablet or a laptop, and the two things no method gives you back.

What works with no SIM, and what doesn't

How to make a call over Wi-Fi, with or without a SIM

"Calling over Wi-Fi" can mean three different things. Which one you can use depends on what's in the phone.

1. Your own number, over Wi-Fi. Needs a SIM. This is the carrier feature. On an iPhone, Apple's steps are: open Settings, tap Cellular, tap Wi-Fi Calling and turn on Wi-Fi Calling on This iPhone. On Android it sits under Network & internet, then SIMs, then your carrier's SIM. After that you dial the way you always have, and the phone uses Wi-Fi when the signal's weak. Your carrier has to offer it.
2. App to app. No SIM needed. WhatsApp, FaceTime, Telegram and Messenger all call over Wi-Fi at no charge. The catch is that the other person needs the same app, so it won't reach a landline, a bank or a hotel front desk.
3. Any real phone number. No SIM needed. An internet calling service carries your voice over Wi-Fi and hands the call to the ordinary phone network, so the other phone just rings. With CallTuv that's a browser tab or the app, and a US number costs $0.03 a minute. The steps are further down this page.

Calling a friend who has WhatsApp? Use WhatsApp. Calling a business, a landline, or anyone who doesn't have your app, you need the first option or the third.

Why Wi-Fi Calling needs a SIM

The name misleads people. "Wi-Fi Calling" sounds like calling over Wi-Fi. Any app can do that. It's actually the trade name for a specific carrier feature: your carrier routes your normal phone line through your Wi-Fi connection when the cell signal is weak. It's still your carrier's line: it uses your number, comes out of your plan's minutes, and shows up on your carrier bill, and none of that changes because the last hop happened to be your router instead of a tower.

Both phone makers say so, in their own way. Apple's support page for the feature tells you to "verify that your carrier offers Wi-Fi Calling", and on a phone with two lines it says to "tap the line you want to use Wi-Fi Calling", because the feature is set per line. Google's Android help puts the switch under Network & internet, then SIMs, then your carrier SIM, and warns that "you may incur additional charges for making calls over Wi-Fi, so check with your mobile service provider". A switch that lives inside the SIM's own settings page, and that your carrier bills, is not going to survive the SIM being removed.

So if you pulled the SIM out of an old phone, or the SIM died, or you're carrying a Wi-Fi-only tablet, the carrier feature is gone. No setting brings it back. Skip to the next section.

"No SIM", "no service" and "no recharge" are three different problems

This question arrives in three flavours. Different answers.

No SIM in the phone. Covered above. Carrier calling is off; app calling and internet calling work over Wi-Fi; US 911 works.

SIM in the phone, no signal. This is the case Wi-Fi Calling was built for. If your carrier offers it and it's switched on, calls and texts to your number carry on over Wi-Fi with no signal at all. That's the one situation where the answer is "turn on Wi-Fi Calling", and it needs the SIM to be there and the plan to be live.

SIM in the phone, plan lapsed or unpaid. The "can I use Wi-Fi Calling without recharge" question. Wi-Fi Calling is billed against your plan, so when the plan is suspended, expect the carrier to suspend Wi-Fi Calling with it. Ask the carrier; the exact behaviour varies. Internet calling doesn't care about your plan's status, which is why people with a lapsed prepaid SIM end up using it.

How to call a real phone number without a SIM

An internet calling service does what your carrier does, minus the carrier: it takes your voice over Wi-Fi and hands it to the ordinary phone network at the far end, so the person you call answers a normal call on a normal phone and never knows the difference. They don't need an app. Here's how it works with CallTuv, which is what we make.

1. Get online. Any Wi-Fi will do: home, a café, a hotel lobby, a friend's hotspot. A phone with no SIM connects to Wi-Fi like any other device.
2. Open calltuv.com in the browser, or install the iOS or Android app. On a SIM-less phone, a Wi-Fi tablet or a laptop, the browser version needs nothing installed. There's no SIM check because there's no SIM involved.
3. Add credit. The minimum is $5. There's no plan and no monthly fee, and the credit doesn't expire.
4. Dial the number with the country code, and read the rate before you press call. A US number, including toll-free ones, is $0.03 a minute; a UK landline is $0.04. Rates for all 232 destinations are on the rates page.
5. Talk. If you reach a phone menu, the keypad works after the call connects, so "press 1 for billing" works the way it would on a phone with a SIM.

Two of our guides cover the situations that usually bring people here. If the phone with the SIM was stolen and you need to call your carrier and bank from something else, the phone-stolen-abroad guide has the order of calls and the numbers. If you're travelling and just don't want to pay roaming, international Wi-Fi calling covers the options. And if the SIM-less device is an iPad, calling from an iPad without an iPhone walks through Apple's own limits and the Safari route.

What no method gives back

Two things, because the forums fudge both.

Your number. Your phone number belongs to your SIM, not to your phone. With the SIM gone, calls and texts to that number go nowhere you can see. That includes the six-digit codes your bank and your email provider send. An internet calling service, ours included, makes outbound calls only; it can't receive a call or a text on your old number, and it doesn't give you a new one. Want the number back? That's a replacement SIM from your carrier, and it's the first call to make.

Emergency calls, outside the US. Inside the US you're covered: 47 CFR 9.10(b) requires carriers to transmit "all wireless 911 calls without respect to their call validation process", which is the legal reason a SIM-less phone can still reach 911, though with no number attached the dispatcher may not be able to call you back. Other countries make their own rules. Some networks refuse a SIM-less emergency call. Internet calling services can't place emergency calls at all: CallTuv doesn't connect to 911, 112 or 999, because the emergency network needs a carrier to route the call and pass your location. For an emergency, use any phone with a SIM, a landline, or the phone's built-in emergency dialler.

Frequently asked questions

Can you use Wi-Fi Calling without a SIM card?
No. Wi-Fi Calling is your carrier's line running over Wi-Fi, and the SIM or eSIM is what ties the line to you. Without it the feature is unavailable. To make calls from a phone with no SIM, use an app both people have, or an internet calling service that dials real numbers.

How do I make a call using Wi-Fi?
With a SIM, turn on Wi-Fi Calling in your phone's settings (on iPhone: Settings, Cellular, Wi-Fi Calling) and dial as usual. Without a SIM, use an app you both have, like WhatsApp, or an internet calling service that rings any ordinary phone number.

Do you need a SIM for Wi-Fi Calling on iPhone?
Yes. Apple's own instructions set Wi-Fi Calling per line and tell you to check that your carrier offers it. No line, no feature.

How do I make a call without a SIM card?
Connect to Wi-Fi, open an internet calling service in the browser or an app, add a few dollars of credit, and dial the number with its country code. The other person answers a normal call. CallTuv works this way from any phone, tablet or computer.

Can I make Wi-Fi calls without recharge, on a lapsed plan?
Usually not. Wi-Fi Calling is billed to your plan, so a suspended plan takes it down too, and the only way to know for sure is to ask the carrier. Internet calling doesn't depend on your plan at all.

Can you call without service, using only Wi-Fi?
Yes, two ways. With a SIM and a carrier that offers Wi-Fi Calling, your own number keeps working over Wi-Fi. Without a SIM, an internet calling service dials real numbers over the same Wi-Fi.

Can you call without data or Wi-Fi at all?
Not an ordinary call. With no cellular service and no internet, the only call a phone can place is to an emergency number, and only where the local network accepts SIM-less emergency calls.

Can you call 911 without a SIM card?
In the US, yes. Federal rules require carriers to connect every wireless 911 call regardless of whether the phone has an account. The dispatcher may not be able to call you back, so stay on the line. Outside the US it depends on the country.

Can you get phone service without a SIM card?
Not carrier service; a number needs a SIM or eSIM. You can get calling without one, through an internet calling service, but it's outbound only: you can make calls, not receive them.

Will an old phone with no SIM work for calls?
Yes, over Wi-Fi. An old iPhone or Android with no SIM runs a browser and apps exactly like a small tablet. It won't receive calls or texts, and it won't make carrier calls.