What is CDMA?

CDMA is one of RedPocket Mobile’s wireless network options. CDMA plans work with GSM-unlocked and Verizon-compatible devices, meaning the phone uses a SIM card and is not restricted to a single carrier.

Isn’t CDMA different from GSM?

Yes, but the difference matters less today than it used to. There are two main types of mobile technology:

• CDMA (Code Division Multiple Access)

• GSM (Global System for Mobile)

GSM phones store important calling information (like the phone number and wireless plan details) on a SIM card, which can be moved between compatible phones. For CDMA phones, this information is embedded in the device's hardware. 

In the past, GSM also had a functional advantage: it allowed voice calls and mobile data to be used at the same time, while older CDMA phones could not. These limitations applied only to 2G and 3G, which are now retired.

Why this difference matters less today

Modern phones use 4G LTE and 5G, which support voice and data at the same time. To support LTE, all carriers—including traditional CDMA carriers like Verizon—had to adopt SIM-based, GSM-compatible devices.

How this affects RedPocket mobile

Although this network is referred to as 'CDMA', the devices used today are GSM-compatible and SIM-based. This is why RedPocket supports only GSM devices, even on networks that were historically known as CDMA.

How to check if your phone is GSM

Look for a SIM card slot, usually located on the side, top, or bottom of the phone, or underneath the phone's battery after removing the back cover.

Check your phone’s user manual or search online for your specific model’s SIM compatibility. If you’re still unsure, contact support for help.

Additionally, please keep in mind that the phone must be unlocked.

Choosing a CDMA plan