I live in an area with horrific reception (90265) and I must put my phone on airplane mode and then activate wifi to make/receive calls. 80% of the time this works. 20% of the time it does not. One call may work, the other does not. This is not an issue unique to this phone -- I have had my s7 replaced several times through your insurance and they all experience this.
I also will not receive voicemail messages in Visual Voicemail unless I turn-off wifi. This means I need to DRIVE to a signal to know if I have a message.
Why do you hate wifi?