I have poo-pooed this advice in the past, but I have learned better. I recently switched from GSM (T-Mobile) to CDMA (Sprint) on my phone and I have better coverage at home. It isn’t as hard as I thought and you don’t have to switch, just ask RW to evaluate the situation based on three addresses you provide. See this article:
It does seem complicated, but you have to switch SIM cards, so it can’t be done in software. Your phone has to support both GSM and CDMA and RW will send you the SIM card without cost.
Kudos to RW for being patient with me while I figured this out.