The area codes for the Las Vegas and Clark County region are primarily 702 and 725. Originally, the entire southern Nevada used the 702 code, but due to the increasing demand for phone numbers from population growth, the 725 code was introduced in 2014. Currently, new phone numbers issued in Las Vegas are a mix of 702 and 725. Both codes represent Las Vegas and Clark County, and numbers starting with 725 are also treated as local Las Vegas numbers.

The northern part of Nevada, including Reno and Carson City, uses the 775 area code. Therefore, within Nevada, long-distance calls apply between the south (702/725) and the north (775). When making a call, long-distance calls within the U.S. generally require dialing 1 first, followed by the area code and phone number. However, most smartphone plans now include unlimited domestic calls, so there is little concern about additional charges.

The major mobile carriers in the Las Vegas area are AT&T, T-Mobile, and Verizon. Among these, T-Mobile has significantly expanded its network since acquiring Sprint in 2020. As a tourist city attracting over 40 million visitors annually, Las Vegas has extensively implemented Distributed Antenna Systems (DAS) to improve indoor communication quality in major hotels, casinos, and convention centers.

In terms of 5G networks, Las Vegas is one of the cities in the U.S. with a rapid adoption rate. AT&T, T-Mobile, and Verizon all provide 5G services along the Las Vegas Strip and in major commercial areas. Notably, during the CES (Consumer Electronics Show) held every January, the latest communication technologies are demonstrated in real-world settings. Las Vegas is also utilized as a testing ground for smart city technologies and autonomous vehicles.

The Internet Service Provider (ISP) with the largest market share in the Las Vegas area is Cox Communications. Cox offers bundled services for cable-based internet, phone, and TV. Recently, Gigabit internet services have expanded, providing speeds of over 1Gbps in some areas. Additionally, AT&T Fiber and utility-based ISPs compete in certain regions.

Harry Reid International Airport (LAS) and most major hotel casinos on the Strip offer free Wi-Fi. However, high-end hotels like Bellagio and Wynn provide free Wi-Fi in common areas but may charge for high-speed internet in guest rooms. Convention centers offer paid high-speed internet services during exhibition periods, and network congestion may occur during large events.

To activate a mobile phone or change a plan in the Las Vegas area, you can visit AT&T, T-Mobile, or Verizon stores or apply online. Numerous mobile carrier stores are located on the Las Vegas Strip and in shopping malls. Low-cost plans from MVNOs (Mobile Virtual Network Operators) like Mint Mobile, Cricket, and Metro by T-Mobile are also popular, providing affordable communication options for immigrants and students.

For international calling services, most smartphone plans include international roaming or offer it as an additional option. To call Korea, dial 001 (or 011) + 82 (Korea country code) + area code (2 for Seoul) + phone number. For smartphones, using the + symbol allows for automatic handling of the country code. Free calls through internet-based messengers like KakaoTalk, Line, and WhatsApp are also widely used.

Las Vegas is continuously developing its communication infrastructure. As of 2023, autonomous shuttle bus pilot operations are taking place in some areas of Las Vegas, along with the establishment of V2X (Vehicle to Everything) communication infrastructure. Additionally, communication infrastructure has been installed in the Las Vegas Loop tunnel system operated by Elon Musk's Boring Company, which connects Harry Reid Airport and the Strip.

In terms of emergency contacts, the 911 system in the Las Vegas area is operated by the Clark County 911 Center. Recently, a Text to 911 service has been introduced, allowing for emergency reporting via text in situations where voice calls are difficult. Multilingual interpretation services, including Spanish, can also be requested after connecting to 911. For non-emergency police inquiries, you can contact (702) 828-3111. It is advisable for newcomers to Las Vegas to save these numbers in advance.