“In the user guide that came with the phone it shows CDMA frequency bands, so why does it not work with Sprint or Verizon also.”
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I believe it is because they are actually using LTE they are also you can only switch phones with your carrier's permission, and a CDMA carrier doesn't have to accept any particular phone onto its network unlike with gsm. What's more, to be considered GSM, a carrier must accept any GSM-compliant phone. So the GSM carriers don't have total control of the phone you're using. according to https://www.pcmag.com/news/cdma-vs-gsm-whats-the-difference
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