Reddit reviews Motorola Moto E Prepaid Phone (Net10)

Not terribly cheap, but I found the Moto E on Amazon for $20: http://www.amazon.com/Motorola-Moto-Prepaid-Phone-Net10/dp/B00QQPNYZ6/ Motos tend to run well, so it may actually be worth the extra money.

Buy a cheap Android phone to do it! If you really just want an mp3 player and sd support, this could work :

https://www.amazon.com/Motorola-Moto-Prepaid-Phone-Net10/dp/B00QQPNYZ6/ref=sr_1_13?ie=UTF8&qid=1480196279&sr=8-13&keywords=moto+e

Edit: Note it says that it supports up to 32gb, it supports above once you reformat the SD card in your computer. It may even give the option on your phone if you plug it in.

Later, not older. Later indicates a higher version number.

I run it from an android phone that's at least 4-5 years old that is running 4.2. My buddy had it laying around in a drawer. Just buy whatever android phone is cheapest. Even something like this would work: https://www.amazon.com/Motorola-Moto-Prepaid-Phone-Net10/dp/B00QQPNYZ6/ref=sr_1_2?ie=UTF8&qid=1519666601&sr=8-2&keywords=cheap+android+phone

My $20 Moto Es are doing very well

https://www.amazon.com/Motorola-Moto-Prepaid-Phone-Net10/dp/B00QQPNYZ6/ref=sr_1_1?ie=UTF8&qid=1464039419&sr=8-1&keywords=net10+moto+e