Last modified 03/01/2025

How to Find Phone Numbers in the USA: Complete Guide to Useful Phone Numbers, Area Codes, and Mobile Companies

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If you’re looking for phone numbers in the USA, whether to contact a business, a person, or a public service, it’s important to know the tools and resources available.

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In this guide, we explain how to use telephone directories in the USA, what the most important useful phone numbers are, how to make calls to the USA from abroad, and what the main mobile companies in the country are. Additionally, we provide a list of important area codes so you can communicate without complications.

1. Telephone Directories in the USA: How to Find Phone Numbers

Telephone directories are a classic tool for finding phone numbers in the USA. Although printed versions have lost popularity, online directories remain very useful. Here are some options:

  • Yellow Pages USA: The most famous directory for finding businesses and services in the USA. Available online at yellowpages.com.
  • Whitepages: Ideal for searching for people and business numbers. It also offers identity verification services.
  • TruePeopleSearch: A free search engine to find phone numbers and addresses in the USA.
  • 411.com: An online telephone directory service that allows you to search for people and business numbers.

2. Useful Phone Numbers in the USA

Knowing the useful phone numbers in the USA is essential for emergencies, public services, and assistance. Here is a list of the most important ones:

  • Emergencies: 911 (police, fire, and ambulance).
  • Tourist information: Many cities have dedicated lines. For example, in New York, you can call 212-484-1200.
  • Roadside assistance: 1-800-AAA-HELP (AAA Assistance).
  • Airports: For inquiries at airports like JFK in New York, call 718-244-4444.

3. How to Call the USA from Abroad

If you need to make a call to the USA from another country, follow these steps:

  1. International prefix for the USA: +1 or 001.
  2. Area code: Each state and city in the USA has a 3-digit area code (e.g., 212 for New York).
  3. Local number: Dial the 7-digit phone number after the area code.

Example: To call a number in New York (area code 212) from Spain, dial 00 1 212 XXX XXXX.
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4. Important Area Codes in the USA

Area codes are essential for identifying regions and types of lines in the USA. Here are some of the most common ones:

  • Area codes:
    • 212: New York, NY.
    • 310: Los Angeles, CA.
    • 305: Miami, FL.
    • 312: Chicago, IL.
  • Special prefixes:
    • 800, 888, 877: Toll-free numbers.
    • 900: Premium-rate numbers (premium services).
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5. Main Mobile Companies in the USA

If you’re in the USA and need a mobile phone service, these are the main mobile companies you should know:

  1. Verizon Wireless: Known for its wide coverage and speed on 5G networks.
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  2. AT&T: Offers flexible plans and a robust network across the country.
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  3. T-Mobile: Stands out for its affordable rates and free international roaming in several countries.
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  4. Sprint: Now part of T-Mobile, it remains a popular option for family plans.
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  5. Mint Mobile: An affordable option that operates on T-Mobile’s network.
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6. Tips for Finding Phone Numbers in the USA

  • Use Google: Search for the person’s or business’s name followed by “phone” or “contact.”
  • Social Media: Platforms like Facebook or LinkedIn may have contact information.
  • Messaging Apps: If you know the person, try contacting them through WhatsApp or Messenger.

How to Choose the Best Mobile Company in the USA: Complete Guide for Tourists and Residents

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Choosing the best mobile company in the USA can be a challenge, especially if you’re a tourist or new to the country.

With so many options available, from prepaid SIM cards to monthly plans, it’s important to understand the features of each provider to make the right decision.

In this article, we provide a detailed guide to the best mobile companies in the USA, recommendations for tourists, and everything you need to know about prices, coverage, and where to buy your SIM card. Stay connected without limits during your stay in the United States!.

Why Choose a Prepaid SIM Card in the USA?

Prepaid SIM cards are the ideal option for tourists and people looking for flexibility. They don’t require long-term contracts, are easy to acquire, and allow you to control your spending on mobile data, minutes, and text messages. Additionally, they avoid the high costs of international roaming. Here’s why they’re an excellent choice:


  • Flexibility: You can top up your balance as needed.
  • Coverage: Access high-speed networks like 4G and 5G.
  • Convenience: Buy your SIM card at airports, supermarkets, or online.

The Best Mobile Companies in the USA for Tourists

1. T-Mobile

  • Price: From $40 for a basic plan with unlimited data.
  • Coverage: One of the fastest and most reliable networks in the USA.
  • Where to buy: T-Mobile stores, Walmart, or online.
  • Advantages: Includes free roaming in Mexico and Canada.

2. AT&T

  • Price: From $50 for a plan with unlimited data.
  • Coverage: Excellent in urban and rural areas.
  • Where to buy: AT&T stores, Target, or online.
  • Advantages: Offers 5G in most major cities.

3. Verizon Wireless

  • Price: From $60 for a plan with unlimited data.
  • Coverage: The most extensive and reliable network in the USA.
  • Where to buy: Verizon stores, Best Buy, or online.
  • Advantages: Ideal for road trips and remote areas.

4. Mint Mobile

  • Price: From $15 per month for 4 GB of data.
  • Coverage: Uses T-Mobile’s network, with good coverage nationwide.
  • Where to buy: Online only at mintmobile.com.
  • Advantages: Affordable and flexible plans, perfect for short stays.

5. Cricket Wireless

  • Price: From $30 for a basic plan with limited data.
  • Coverage: Operates on AT&T’s network, with good nationwide coverage.
  • Where to buy: Cricket stores or online.
  • Advantages: Affordable plans with no contract.

Where to Buy SIM Cards in the USA

  1. Airports: Major airports like JFK (New York) and LAX (Los Angeles) have kiosks selling SIM cards.
  2. Supermarkets: Stores like Walmart, Target, and Best Buy offer SIM cards from different providers.
  3. Provider Stores: Find physical stores of T-Mobile, AT&T, Verizon, and Cricket in shopping centers and main streets.
  4. Online: Some providers like Mint Mobile only sell their SIM cards through their website.

Tips for Choosing the Best Mobile Company

  1. Length of Stay: If you’re traveling for less than a month, a prepaid SIM card is the best option. For longer stays, consider monthly plans.
  2. Coverage: Verify that the provider has good coverage in the areas you’ll visit.
  3. Mobile Data: Choose a plan with enough data for browsing, maps, and social media.
  4. Roaming: If you plan to visit other countries, choose a provider with international roaming included.
  5. Compatibility: Make sure your smartphone is unlocked and compatible with USA networks.

How to Switch Mobile Companies in the USA Without Losing Your Number: Step-by-Step Guide

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Are you thinking about switching mobile companies in the USA but worried about losing your current number? Don’t worry! In the USA, number portability is a right that allows you to keep your phone number when switching providers.

In this article, we explain everything you need to know to make the switch easily and without complications. Follow this step-by-step guide and enjoy the benefits of your new provider without losing your number. Let’s get started!.

What is Number Portability in the USA?

Number portability is a process regulated by the FCC (Federal Communications Commission) that allows mobile phone users to keep their phone number when switching providers.

This right applies to both mobile lines and landlines, and it’s completely free. Thanks to this regulation, you can choose the best mobile company in the USA without worrying about losing your number.

Steps to Switch Mobile Companies in the USA Without Losing Your Number

1. Choose Your New Mobile Company

  • Research the available options and choose the mobile company that best suits your needs. Some of the most popular in the USA are Verizon, AT&T, T-Mobile, Mint Mobile, and Cricket Wireless.

2. Verify Your Number’s Eligibility

  • Make sure your current number is eligible for number portability. Most numbers in the USA are, but it’s important to confirm this with your new provider.

3. Request the Porting Code (Transfer Number)

  • Contact your current provider and request the porting code (also known as the Transfer Number or Account Number). This code is essential to start the portability process.

4. Provide the Information to Your New Provider

  • Once you have the porting code, provide this information to your new mobile company. You will also need:
    • Your current phone number.
    • Your account PIN or password (if applicable).
    • Billing information (to activate your new plan).

5. Activate Your New SIM Card

  • Your new provider will provide you with a SIM card. Insert it into your phone and follow the instructions to activate it. The portability process usually takes between a few hours and one business day.

6. Confirm the Portability

  • Once the process is complete, verify that your number has been transferred correctly. Make a test call to ensure everything works properly.

Tips for a Smooth Switch

  1. Do not cancel your current service: Wait until the portability process is complete before canceling your service with the previous provider.
  2. Review your current contract: Some providers may charge an early termination fee. Make sure you know the terms before making the switch.
  3. Backup your data: Before switching providers, back up your contacts and important data.
  4. Check coverage: Make sure your new provider has good coverage in the areas where you use your phone the most.

Frequently Asked Questions About Number Portability in the USA

How long does the portability process take?

  • The process usually takes between 2 and 24 hours, although in some cases it may take up to one business day.

Can I switch providers if I have an active contract?

  • Yes, but you may have to pay an early termination fee. Review the terms of your current contract.

What if my number is not eligible for portability?

  • In rare cases, some numbers (such as those from old prepaid services) may not be eligible. Check with your new provider to explore your options.

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