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www.verizonwireless.com/support/knowledge-base-218813

Any service requests related to CDMA devices may receive limited support and customers are encouraged to upgrade to newer technology. Impacted Devices: 3G-only devices, including 3G basic phones and 3G smartphones. 4G LTE smartphones that do not support HD Voice (ex: Apple® iPhone® 5s or prior).

community.verizonwireless.com/t5/iPhone-6/iPhone-6s-CDMA-or-GSM-or-both/td-p/...

I have an iPhone 6s which I read is supposed to be both CDMA and GSM compatible but is sometimes locked once used on a network. I have Verizon, but no 2 year contract, so is my phone NOT locked to CDMA since I dont have a contract? Traveling soon and would prefer to bring this phone instead of my ...

www.verizonwireless.com/support/knowledge-base-207031

Tap the International CDMA switch to turn on or off. CDMA is a wireless technology that Verizon uses to place and receive calls within the US and some global destinations. Turning off International CDMA while in another country may improve poor messaging or data performance. Related Topic: Prepare for International Travel

www.techradar.com/news/phone-and-communications/mobile-phones/verizon-cdma...

Verizon and Sprint, on the other hand, use CDMA, which stands for Code Division Multiple Access. All it means is that Verizon can pile on several people to use its network at once.

osxdaily.com/2012/11/15/determine-iphone-gsm-or-cdma

iPhone 5: A1429 (* World GSM & CDMA) iPhone 4S: A1387 (* dual band CDMA & GSM world phone) iPhone 4: A1349; Knowing the model numbers is guaranteed and is pretty quick, and it’s also the best way to determine what model an iPhone is that won’t turn on. For customers in the USA, another easy way to tell if it’s GSM or CDMA is just to find ...

www.verizonwireless.com/wireless-devices/smartphones/iphone

The latest information on new iPhones, Apple Watches, and next generation AirPods from Verizon Wireless including Pricing, Dates, and full list of features.

www.verizonwireless.com/support/knowledge-base-55482

Apple® iPhone® 4s - Turn International CDMA On / Off. Postpaid customers: To get specific info on using your service while traveling internationally, visit our International Trip Planner, enter your info then click 'Sign in' for a personalized solution or 'Get Started' if you don't want to sign in.

everymac.com/.../differences-between-att-gsm-iphone-4-verizon-cdma-iphone-4.html

At first glance, the iPhone 4 models -- the originally released iPhone 4 (GSM) and its similar late model brethren iPhone 4 (GSM, Revision A)-- which both were available exclusively on AT&T in the US, and the iPhone 4 (CDMA), which was available on Verizon and Sprint in the US -- look identical.

www.whistleout.com/CellPhones/Guides/Can-I-use-my-verizon-sprint-phone-on-a...

Sprint and Verizon are CDMA carriers. For that reason, it's easier to take a phone from Sprint to Verizon or vice versa than it is to take a phone from Sprint or Verizon to AT&T. That's because in the former case you're not jumping network types. Also, swapping phones on GSM networks is easier because GSM-compatible phones use SIM cards.

community.verizonwireless.com/t5/iPhone-4/Verizon-iPhone-4S-SIM-UNLOCK...

Verizon has confirmed (here and here) they WILL unlock the SIM on the iPhone 4S, allowing for use of local SIM cards while traveling abroad (no word yet on whether this will allow for use on AT&T and T-Mobile.) This is different than the jailbreak unlocking method; SIM unlocking through Verizon is p...