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What is CDMA?

CDMA is one of RedPocket Mobile’s wireless network options. CDMA plans work with GSM-unlocked and Verizon-compatible GSM 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) and GSM (Global System for Mobile).

  • CDMA phones originally stored service information—like your phone number and plan—directly on the device.

  • GSM phones store this information on a SIM card, which can be moved between compatible phones.

In the past, GSM also had an advantage: it allowed voice calls and mobile data to be used at the same time, while older CDMA networks could not. These limitations applied only to 2G and 3G networks, 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 regardless of the carrier. 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 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, bottom, or under the battery.

    Note: iPhone models iPhone 14 and newer are eSIM-only. While these devices are GSM-compatible, they do not have a physical SIM card slot.

  • Check your phone’s user manual or search online for your specific model’s SIM or eSIM compatibility.

  • If you’re still unsure, contact support for help confirming compatibility

 

Choosing a CDMA Plan

If you’re interested in a CDMA calling plan, visit redpocket.com/plans/plans-cdma. Here's some important information to keep in mind!

  • Plans must be activated within 90 days of purchase

  • You can upgrade, downgrade, or cancel anytime

  • All new line activations are backed by a 7-day return policy

Visit redpocket.com/plans/plans-cdma to select the CDMA plan that’s right for you.