Will the Galaxy S7 phones work with CDMA/Verizon towers for voice and SMS roaming?
Yes but with 2 caveats:
At this time you cannot buy and S7 from a seller other than RW and configure it for CDMA. We hope that will eventually be possible.
If you buy and S7 from RW you need to first run the coverage check. If some phones are excluded then yes, you will receive an S7 configured for CDMA. If all phones are included then you need to run a coverage check for a zip code that will exclude the GSM-only phones before you place your order because the way your S7 will be configured depends on the last iteration of the coverage check.