I have been developing apps for Android for a while and needed a really cheap device to do basic Android Testing on.
I went to China Mobile in China and looked around and found this little Gem! It runs Android 2.3.5 and is perfect for Entry Level Android App development Testing and ADB.
You can find my guide on how to make it and many other cheap phones that run the Spreadtrum Chipset work here –
You can also find my Guide on how to root almost any phone including cheap android smartphones here –
You can go over to China Mobile and ask for this phone, they gave it to me for 200Yuan and they still gave me the 200Yuan back as talk time on the phone.
ZTE 中兴 U791