I have TMobile for my iPad SIM. The only time it seems to work is when I have WiFi anyway. I have literally only used it one time when WiFi wasn't available when I was checking the lightning map out at the Pop Warner football fields out on Apalachee Pkwy. Based on that I would NOT recommend for a regular phone. Every time I have tried to use it and it wasn't available my Verizon phone was working just fine.
I just switched from Verizon to At&t and am regretting it.
Planning on just paying off my phone and switching back to VZW. While I appreciate lower monthly bills, I appreciate a phone that works even more.