Wifi Calling on Cricket with AT&T Galaxy S5 and LG V20 workaround using IPhone
I received this idea from Reddit but can't find it at the moment however I have been needing WiFi calling for so long due to my house being in a dead zone. As we all know, Cricket only supports 2 phones on Android.
Well my co-worker let me sell her Verizon iPhone 6+ and I decided to stick my sim in there for a few hours. I then took the SIM out and put it in my LG v20, enabled wifi calling and it took me to an E911 page where I was able to register my sim with my address. I successfully made some test calls and text messages and then put it in my AT&T Galaxy s5 and sure enough it worked!
So there you have it. All you need to do is find a friend with an AT&T or Verizon/Unlocked iPhone and let it sit for a few hours while the system recognizes your SIM.