What an international phone number is and why you might need one

An international phone number is a working phone line that belongs to a country other than where you physically are. If you're renting a car abroad, having a phone number in that country — rather than your home country — means local businesses, rental agencies, and emergency services can reach you without making an international call, and you can call them without international rates.

When you rent a car in another country, the rental company needs a way to contact you about pickup times, damage claims, or roadside emergencies. Using your home country's phone number works, but it costs the rental company money to call internationally, and it costs you money to receive calls while abroad. A local number in the rental country solves both problems.

You have three main routes: buy a local SIM card and phone plan, use a virtual phone number service, or keep your home number and pay international rates. Each has different costs and trade-offs depending on how long you're renting and which country you're visiting.

Key Takeaways

  • A local SIM card from a phone shop in the rental country is usually the cheapest option for calls and texts, costing $10 to $40 for a week or two of service.
  • Virtual phone number services like Google Voice, Skype, or Wise let you keep a number in any country without a physical SIM, but they work best for receiving calls and texts, not making many outgoing calls.
  • Your home phone number will work abroad, but incoming calls and texts cost you money, and outgoing calls to local numbers cost international rates.
  • The rental company needs a working phone number in the country where you're renting, so confirm which type of number they accept before you arrive.
  • If you're keeping your home number, tell your phone provider you're traveling so they don't block your account for fraud.

Buying a local SIM card in the rental country

The simplest and cheapest route for most car rentals is to buy a prepaid SIM card at a phone shop, airport kiosk, or supermarket in the country where you're renting. You walk in, buy the card (usually $5 to $15), hand over your passport, and the shop activates it on the spot. You then buy credit or a data plan — typically $10 to $30 for a week of calls and texts.

This gives you a real local phone number that works everywhere: the rental company can call you, you can call them back, and you can call local restaurants, hotels, or roadside information without international charges. The number is active as soon as you leave the shop.

The catch is that your phone must be unlocked — meaning it's not locked to your home country's phone company. Most phones sold in the United States after 2015 are unlocked by default, but if you're not sure, contact your phone company before you travel. If your phone is locked, you can ask your provider to unlock it (usually free if you've owned the phone for at least 40 days), or you can buy a cheap unlocked phone abroad for $30 to $50.

Keep your old SIM card in a safe place so you can swap it back when you return home. Some people take a photo of it first so they remember which way it goes in.

Using a virtual phone number service

A virtual phone number is a phone line that exists only in software — there's no physical SIM card. Services like Google Voice (United States only), Skype, Wise, or Twilio let you create a phone number in almost any country, and you can receive calls and texts on that number through an app on your phone.

This works well if the rental company mainly needs to reach you and you don't need to make many outgoing calls. You set up the account before you travel, give the rental company your virtual number, and they can call or text you for free (to them) because it's a local number in their country.

The downside is that making outgoing calls and texts from a virtual number often costs money — sometimes per minute, sometimes per message. If you need to call the rental company back, call a mechanic, or text a hotel, those charges add up. Virtual numbers also sometimes don't work with two-factor authentication codes from banks or payment apps, which can be a problem if you need to book hotels or pay for fuel online during your trip.

Virtual numbers are best as a backup: set one up before you leave, but plan to buy a local SIM as your main number so you can make calls without worrying about per-minute charges.

Keeping your home phone number and paying international rates

If you don't want to buy a new SIM or set up a virtual number, you can keep your home country phone number and use it abroad. Your phone will work, but the costs are real: your phone company will charge you to receive incoming calls (usually $0.50 to $2 per minute), to send texts (usually $0.50 to $1 per message), and to make outgoing calls to local numbers (usually $1 to $3 per minute).

This is expensive if the rental company calls you multiple times or if you need to call them back. A single 10-minute call to roadside information could cost $10 to $30. Over a week-long rental, the charges can exceed the cost of a local SIM card.

However, this route requires no setup and works when ready. If you're renting for only a few hours or you're confident you won't need to make calls, it might be simpler than buying a SIM. Before you travel, contact your phone provider and tell them you're going abroad — some providers block accounts for fraud if they see sudden international activity, and a heads-up prevents that.

Some phone companies offer international plans that reduce per-minute charges to $0.25 or lower, but these plans usually cost $10 to $15 per day and are only worth it if you're making many calls. Check your provider's website or call them before you leave.

What the rental company needs from you

Before you book or arrive at the rental counter, confirm with the rental company which type of phone number they accept. Most large companies (Hertz, Avis, Budget, Enterprise) accept any working phone number — local, virtual, or from your home country. They just need a way to reach you if there's a problem with the car or your reservation.

When you pick up the car, you'll give them the phone number during the check-in process. Write it down or have it saved in your phone so you don't forget it under pressure. If you're using a virtual number, test it before you arrive at the rental counter to make sure calls and texts actually reach you.

Some smaller or regional rental companies may have different policies, so a quick email or phone call to them before you travel saves confusion at pickup time. If you're renting through a travel app or website, the confirmation email usually has a phone number you can call to ask questions.

Timing and what to do before you leave

If you're buying a local SIM, plan to do it within your first hour in the country — at the airport, at a phone shop near your hotel, or at the rental car location itself. Most airports have phone shops in the arrivals area, and staff can help you choose a plan. Bring your passport.

If you're using a virtual number, set it up at least a week before you travel so you can test it and make sure it works with your phone. read the app, create the account, and make a test call from your home country to confirm the number is active.

If you're keeping your home number, call your phone provider 3 to 5 days before you leave and tell them your travel dates and destination. Ask them to note your account so they don't flag your activity as fraud. Also ask what your rates will be — some providers offer temporary international plans that are cheaper than their standard rates.

Frequently Asked Questions

Can I use my home phone number if I don't want to buy a local SIM?

Yes, your phone will work abroad on your home number. The rental company can call you, and you can call them back. However, you'll pay international rates for incoming and outgoing calls — usually $0.50 to $3 per minute. A week of regular calls could cost $50 to $100. A local SIM usually costs $20 to $40 total.

What if my phone is locked to my home phone company?

Contact your phone provider and ask them to unlock it — this is usually free if you've owned the phone for at least 40 days. If they won't unlock it or you don't have time, you can buy a cheap unlocked phone in the rental country for $30 to $50, or use a virtual phone number instead of a SIM card.

Do I need a local phone number if I'm only renting for a few hours?

Not necessarily. If you're picking up and dropping off the same day and you don't expect the rental company to call you, your home number is fine. But if there's any chance they'll need to reach you about the reservation or the car, a local number is safer because they won't have to pay international charges to call you.

Will a virtual phone number work for two-factor authentication codes?

Sometimes, but not always. Some banks and payment apps won't send codes to virtual numbers, or the codes arrive slowly. Test your virtual number with your bank before you travel. If it doesn't work, keep your home SIM card in your phone as a backup, or plan to use a local SIM for authentication codes.

What happens to my home phone number while I'm using a local SIM?

Your home number stays active, but calls and texts to it won't reach you because your phone is using the local SIM. People trying to reach you will either get voicemail or their call will fail, depending on your provider. When you return home and swap back to your original SIM, your home number works again. You don't lose the number.