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Verizon's 4G LTE phones are GSM SIM unlocked. There was a thread last year for the iP6s/iP6s+ that claimed that some of the Verizon iPhones were not globally unlocked but you would need to search for it. Idk what the outcome was.
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Please do notice "Only Verizon Post-paid 4G LTE phones" come as unlock out the box. Best buy and other retailer, they sells prepaid and post paid, so depend on witch phone you purchase from them. I purchase an iPhone 6 16GB Verizon on prepaid and when i test out a tmobile sim card after activating the iPhone it relock and said i need a sim card from supported carriers. So please be careful out there, people claiming verizon phones, but sometime it come as "Lock" too. I call verizon, speak to 3-5 peoples so far and they all tell me that Verizon Prepaid Phones come as lock for a full 12 months of prepaid services before it can require to be unlock. This is why they are selling it for $199 while original price is $349.
 
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