JioPhone has 2.4 Inch QVGA TFT screen display. It has about 167 PPI ratio.
No. JioPhone does not come with earphones. You have to buy it separately.
JioPhone does a plastic keypad.
JioPhones comes with 4GB Internal Memory - so just like a normal Android smartphone, you can save as many contacts depending on the free space in your phone. In practial sense, you can store unlimited contacts.