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Can I use a CDMA phone on a GSM network?

Usually - NO (sorry!)

CDMA and GSM are totally different technologies - they are network technologies linked to each carrier here in the US

T-Mobile and AT&T run on GSM networks

Sprint and Verizon run on CDMA technology

The main difference is that a GSM phone will usually need a sim-card to be inserted to connect to the network. CDMA phones sometimes have the sim-card built in to them - it all depends on the age and brand on the phone

The general rule is that a CDMA phone wont work on a GSM network, and vice versa. They run on different frequencies

There are a couple of exceptions - most new iPhones like the 6s and some Google Nexus phones CAN run on both technologies. You would need to check with the manufacturer whether this applies to your specific phone

If you want to switch carrier and keep your phone, you can. Heres a view of all the carriers that your specific phone will work with:

Sprint Phones - Bring Your Own 

T-Mobile & AT&T - Bring Your Own

Verizon - Bring Your Own

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