[wroman]

I got the Fsmart M5 off Amazon for $20 and is the size of a credit card.

https://www.amazon.com/gp/product/B00UWT5DM4/

Works great on T-Mobile, with one exception: it cannot receive MMS, so you don't get notified if someone sends a photo or group text.

[busterarm]

When the 2G networks are shut down, this phone will no longer work.