Flip Phone for T-Mobile Network

Can anyone recommend an inexpensive flip phone that's compatible on the T-Mobile network?

It's only needed for basic voice service. So any dumb-phone should suffice. It can even be a used device.

Presumably it should be 4G comparable, in order to survive the 3G network shutdown.

TIA

Alcatel 4052W or 4051S (unlocked). You can find them on eBay.

Yes. I got a 4052 (Smartflip) and it works just fine for voice. It has internet too but I haven't bothered with that. My 4052 is locked to ATT but I've been using it on an ATT MVNO (FreeUp) without any problems at all.

The 4052W is locked to T Mobile and the 4051S is locked to Verizon. I have a 4051S but mine is unlocked.

Here's a picture of the 4052:


It's locked to ATT but I use it on FreeUp just fine. I didn't specify a letter after the number because I wasn't sure what the correct number was.

UPDATE: It's 4052R

What is the street price for these Alcatel flip phones?