There are plenty of mysterious terms related to mobile phones, connectivity, and cellular devices. Here, we break down the most common tech terms you'll encounter and what they actually mean (without the technical jargon!).

You'll find the answers to all your questions, including:

What Is a SIM Card?

"SIM" stands for "subscriber identity module." SIM cards are tiny memory chips that store information about you as a mobile customer and give you access to a carrier's network, allowing you to call, text, and access data. You can think of a SIM card as a two-step verification for your carrier: They identify you as a customer and verify if your SIM is compatible with their network(s).

What Is a Dual SIM?

A Dual SIM refers to a mobile phone or device that can house more than one SIM at a given time, whether it's two physical SIMs or an eSIM and physical SIM. This gives your phone the built-in ability to switch between carriers and networks. Having the ability to transfer or swap networks allows you to remain connected at home and in regions outside of your regular network.

SIM evolution

What Is an eSIM

"eSIM" stands for "embedded subscriber identity module." It's a tiny memory chip that's built into your device, eliminating the need to remove a physical SIM to switch carriers. Instead, you can easily and affordably download a prepaid data plan and connect to a new network within minutes. 

With an eSIM, you can:

  • Download a data plan and be up and running within minutes
  • Continue to use your primary number for calls and text messages while using your eSIM for data and internet 
  • Store multiple eSIMs on your phone, making switching between plans a breeze
  • Avoid daily roaming charges from your mobile provider
  • Easily switch between local, regional, or global data plans
  • Eliminate the need to find a SIM vendor while traveling

What Is Data Roaming?

Data roaming is when you use a foreign wireless/cellular provider's network to access your smartphone services abroad. You start roaming as soon as you travel outside your home network. When you roam, you operate as a guest of a new network, and call, text, and data services get charged at a different (typically higher) rate. Daily roaming charges can be pricey — here's a closer look at how they add up (and how to avoid them).

What Is a Network?

A cellular network is a series of service towers that enable you to connect to a carrier's mobile network and make calls, send texts, and access data. Different carriers own, operate, and outsource connectivity to various providers. You can think of a cellular network as owning different ports in a city. The owner of the port decides who has access to the service and at what cost. When your network is not within the owner's service range, you're granted access but charged a premium (known as roaming).

What Is Local Data?

Local data is information that is stored directly on your device. This includes apps, photos, music, and more that take up space on your phone. Local data can be managed directly in your settings.

Occasionally, local data will overlap with cellular service from your provider. SMS contacts and records can be stored on your phone or device, including call history, and data downloaded over your provider's network.

What Is an App?

"App" is short for "application." Applications are programs downloaded directly to your phone or mobile device. The term is interchangeable with programs or software but has been commonly used in relation to mobile devices. 

What Is the Difference Between 3G, 4G, and 5G?

3G (3rd generation networks) refer to the common name of cellular towers that offer 2mbps for stationary activity and 384kbps when on the move (like a vehicle). They're relatively common among networks already in place but are becoming more outdated as new generations replace them.

4G (4th generation networks) are the successor to 3G networks. They're on average 500X faster than 3G networks, offering 10-100Mbps download speeds. Introduced in the late 2000s, their exponential difference in speed has slowly become standard across most global coverage areas.

5G (5th generation networks) are the successor to 4G networks. With their low latency and high bandwidth, they're far faster than 4G. This could mean streaming videos in 4K, downloading huge files, and/or sharing information at record speeds.

What Is a VoIP?

"VoIP" stands for "voice over internet protocol." VoIP allows you to place and receive calls over the internet rather than a traditional phone line. In the 1990s when dial-up modems were commonplace, VoIPs presented a way to connect without having to use a landline. Today, apps like Skype and Google Voice use VoIP to allow you to make calls over the internet. They're often used for business calls, personal calls, and general audio/video communication.

What is Mbps?

"Mbps" stands for "megabytes per second." It describes the bitrate (or speed) of uploading and downloading data. Mbps is the most common bitrate measurement as most data does not transfer at a kilobyte, gigabyte, or terabyte rate. Gbps and Tbps might become common terms in the next few years.

From bitrates to eSIMs, you're now equipped with the latest lingo to discuss your phone or mobile device. Dive into our latest blog posts to keep learning!