You can make and receive calls without a SIM card by using an internet calling service over Wi-Fi. A SIM only connects a phone to a mobile carrier. Internet calling skips the carrier on your side: a service such as LimePhone gives you a real phone number and connects your calls through the internet, on a computer browser or an Android phone with no SIM inside. Calls to the US, Canada and the UK use your plan minutes, and international calls start at $0.032 a minute.
Key points
- A phone with no SIM can still use Wi-Fi, so it can run internet calling apps.
- Without a SIM you have no mobile number of your own. An internet calling service supplies one instead.
- LimePhone works in a browser and in its Android app, and every plan includes a US, UK or Canadian number.
- Without a SIM you can only call while you have Wi-Fi or another internet connection.
What does a SIM card actually do?
A SIM card identifies your phone to a mobile carrier. It carries the subscription that gives you a mobile number, cellular calls, texts and mobile data. Take it out and the phone loses all of those, but keeps everything else, including Wi-Fi, apps and the microphone.
That is why a phone without a SIM can still make calls: it just has to make them over the internet instead of the cellular network.
Ways to make calls without a SIM card
- Messaging apps such as WhatsApp, FaceTime and Signal call other users of the same app for free. Most need a mobile number to register, and none can ring a landline or a business switchboard.
- Prepaid calling apps dial real numbers from a balance, but often show an unknown number and cannot receive calls.
- An internet phone service such as LimePhone gives you a real number that can call and be called, on any device with internet.
| Messaging apps | Prepaid calling apps | LimePhone | |
|---|---|---|---|
| Calls landlines and mobiles | No | Yes | Yes |
| A number people can call back | No | Rarely | Yes, US, UK or Canadian |
| Texts on the same number | In-app only | Rarely | Yes |
| Cost | Free | Prepaid balance | From $9 a month |
When calling without a SIM makes sense
- Travelling: keep a home-country number reachable over hotel Wi-Fi without roaming charges.
- Living abroad: keep a US, UK or Canadian number for banks and family while using a local SIM for everything else.
- A second number: a work number on an old phone, a tablet or a laptop, without a second SIM or a second contract.
- Between phones: stay reachable while a phone is lost, broken or being replaced.
How to set it up with LimePhone
- Start a free trial and pick a number on the number checker.
- Connect the device to Wi-Fi.
- Sign in on a computer browser, or install the Android app on a phone with no SIM.
- Call from the dialer. Your LimePhone number shows as the caller ID, and incoming calls ring wherever you are signed in.
What it costs
Plans start at $9 a month, with one number, unlimited incoming calls and texts, and 2,000 outbound minutes to the US, Canada and the UK. Other countries are charged per minute; every rate is on the rates page.
How we checked
LimePhone prices and per-minute rates in this article come from the live LimePhone rate table and plan list, checked on October 24, 2026. Rates change; the current figures are always on the rates page and pricing.
Frequently asked questions
Can I make calls without a SIM card?
Yes. Over Wi-Fi, an internet calling service lets you call landlines and mobiles without a SIM. LimePhone works in a browser and in its Android app.
Can I receive calls without a SIM card?
Only if you have a number from an internet calling service. Every LimePhone plan includes a US, UK or Canadian number that rings on your devices over the internet.
Does WhatsApp work without a SIM card?
WhatsApp runs over Wi-Fi without a SIM inside the phone, but you need a mobile number to register, and it only calls other WhatsApp users.
Can I send texts without a SIM card?
Yes, with a service that includes SMS. LimePhone plans include outbound texts, starting at 500 a month on Lite, and unlimited incoming texts.
Can I call emergency services without a SIM?
Do not rely on it. Rules vary by country and device, so keep a mobile or landline available for emergencies.
About the author
Vincent Hawley writes LimePhone's guides to business phone numbers, international calling and calling over the internet.
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