I'm currently using a Sanyo 3G flip phone on Patriot Mobile, a Sprint MVNO. They say that support for this phone will be ending this year. Sprint has the best coverage at my home, and I refuse to use Verizon (AT&T and T-Mobile are not usable). I'm not sure how to identify a compatible 4G flip phone at this point. On this forum I would like advice on inexpensive Android phones to consider. I don't actually want to access network data. I would like to use the phone on my home WiFi, backup up contacts, and play mp3 files.