By: Vincent Totino
Read Time: 7 min.
March 20, 2025
Getting everything you need from your mobile network?
Buying a new smartphone sounds easy: pick a device, grab a protective case, and you're good to go. In reality, there's a bit more to it. Before deciding which phone to buy, you'll need to choose a mobile carrier-which, confusingly, isn't the same thing as a mobile network. So, what is a mobile carrier, and how do you choose the right one for your needs?
Read on to understand the differences between mobile carriers and mobile networks, how to choose a network carrier, and discover the meanings behind some other common wireless lingo that you should know before purchasing a new phone.
A mobile carrier, also known as a phone carrier or cellular company, is a mobile network operator (MNO) that supplies cellular connectivity to mobile devices, such as smartphones and tablets. These carriers manage the infrastructure needed for cellular communication, including cell sites, radio signals, and network equipment that allow your phone to make phone calls, send texts, and access the internet.
Your mobile phone service provider is the company you pay a monthly price to for unlimited talk and text, high-speed data, and additional features like mobile hotspot access and international calling. Some wireless carriers offer bundled deals with internet providers, letting you save when combining services like internet and mobile.
There are several major wireless carriers in the United States. The most well-known (and widely used) include:
Phone carriers offer wireless communication services to customers through cellular networks. These networks enable voice calls, text messaging, and data transfer for mobile devices such as smartphones and tablets.
Wireless carriers must obtain a radio spectrum license from the United States government to operate in any region of the country. Additionally, they often establish agreements with other carriers to ensure customers can access data (or "roam") when outside the network's coverage area.
Most phone carriers offer a range of plans with different voice, text, and data allowances. Typically, the fewer features you choose, the less your service will cost.
The term “mobile network,” or mobile virtual network operator (MVNO), refers to the technical infrastructure that enables wireless communication between mobile devices and a carrier's core network.
There are several generations of mobile networks, each with differing speeds, capacities, and capabilities. These generations are often referred to as "G" (generation) networks.
In the USA, the following mobile network generations have been deployed:
The power of a carrier network's signal may be influenced by factors other than coverage. Your call or data quality can be affected by a number of factors, including signal speed, dependability, and network latency.
Carriers and networks are both wireless service providers that supply cellular connectivity to mobile phone users. However, while carriers operate nationwide, mobile networks operate regionally or in niche segments of the population.
Another key difference is that mobile networks do not own the infrastructure needed to transmit signals. Rather, they operate using one or several networks that they lease from licensed operators in the area.
Optimum Mobile, for instance, is a mobile network that uses T-Mobile's infrastructure to provide wireless service to customers. Optimum customers can choose from a range of 5G plans, depending on their needs-from 1GB plans for those who use data sparingly to the Unlimited Max plan, which offers 50GB premium data.
Below, we'll further break down the differences between mobile networks and mobile carriers. These are three core distinctions:
Mobile networks invest in developing new technologies such as 5G, whereas mobile carriers focus on offering mobile phone plans, phone deals, and contract options for customers.
Mobile carriers are responsible for marketing, selling plans, and handling customer service, while mobile networks involve the deployment, maintenance, and optimization of the physical and virtual infrastructure.
Mobile carriers influence the user experience through customer service, competitive pricing, and the offering of different wireless plans. Mobile networks impact it by providing reliable and high-quality wireless connections.
There are two primary radio signals used by wireless carriers: GSM and CDMA.
Understanding the difference between these commonly-used radio bands is important, as it can help you determine which phone carrier is best for your needs.
GSM is the more popular of the two frequency bands, with a more significant market share worldwide. Furthermore, with a GSM phone, users can remove their SIM card (the small chip that contains your phone data) and insert it into a new device. This makes it easier to switch between devices, as all of your data is stored on a removable chip, rather than on the device itself. CDMA phones, meanwhile, do not allow for the removal of the SIM card.
Another important distinction is that GSM allows you to make calls and use data simultaneously, whereas CDMA does not.
In the United States, AT&T and T-Mobile are the only mobile carriers that use the GSM frequency. Verizon and US Cellular, meanwhile, are CDMA carriers.
The frequency range supported by smartphones offered by respective carriers across the United States is also influenced by the network used. AT&T and T-Mobile, for example, only sell GSM-compatible phones. The lone exception is Verizon, which sells phones that support both GSM and CDMA bands, despite having a CDMA-only network.
When choosing a network carrier, you'll want to consider several different factors before making your decision. These factors include:
Different cell phone providers offer a range of mobile phone plans at various price points. If you want the best savings, look for discounts on multiple lines, family plans, or bundled deals with internet providers.
For a set monthly charge, some mobile carriers provide a plan with unlimited data. Others provide more adaptable options where you only pay for the features you utilize. If you plan on using lots of data, opting for a carrier with unlimited plans may be your best option.
Some service providers' payment plans involve additional fees. These costs could apply to services like international calling, WiFi hotspots, ringtone subscriptions, and insurance policies. Ask the service provider about any additional costs you could have to pay before signing up for a plan.
Plans from different service providers may include different features. For instance, some phone plans may offer limitless text messages, WiFi hotspot functionality, and data for watching or uploading videos.
You may be able to find a service provider with a more basic plan at a lesser price if you don't need these features.
The overall region that a carrier network's signal covers is known as coverage. Look for a network that provides good coverage in your neighborhood. If you frequently travel or communicate with people who reside in different locations, you'll want to look for a network with a greater service area (or one that offers international data plans).
The power of a carrier network's signal may be influenced by factors other than coverage. Your call or data quality can be affected by a number of factors, including signal speed, dependability, and network latency.
Generally, you'll have to sign a contract before using a carrier network's services. This contract forbids you from changing networks without paying a fee before the contract expires. Consider choosing a carrier network that offers a short contract term or the ability to pay without a contract if you think you might wish to move networks.
International Roaming: International roaming allows you to use mobile networks in other countries while traveling. Some plans allow for international roaming; others don't. If you travel frequently, it can be a good idea to choose a mobile carrier that offers the option to turn on international roaming.
Optimum Mobile offers affordable phone plans with unlimited talk, text, and data on T-Mobile's network, ensuring high-speed connectivity and nationwide coverage. Whether you need a single line, a prepaid plan, or multiple lines for the family, Optimum Mobile has you covered.