convert iphone 6 from cdma to gsm

[flipdaflyr]

My iPhone 6 uses Verizon's CDMA system. I would like to switch to Tracfone and use AT&T's GSM system. I realize Tracfone can also serve CDMA, but there is a critical dead spot on Verizon's system where I travel frequently.

 

[hang-the-9]

Find someone with a GSM iphone and trade with them. You can't change it.