Nothing. The resolution dimensions multiplied together gives total "pixels" on the display. PPI refers to the quantity of pixels in a given square inch on the display (pixels per inch).
QVGA stands for Quarter Video Graphics array and is a term for screen display resolution. Common resolutions for smartphone screens are 240x320 which is QVGA. Screens are now displaying in full HD at 1080x1920
The difference - is in the resolution of the image (or text). With a TFT display, it's possible for the human eye (albeit with difficulty) to distinguish individual pixels. With the retina display, the resolution is so fine, the makers claim it's impossible to distinguish individual pixels with the naked eye. Think of it as the difference between 'standard' and HD television !
There's not a difference. They are one and the same.
The biggest difference is the mobility of a cell phone versus a home phone and the service it is tied to.
The difference between a regular phone and a PCS phone is that a regular phone can be paid monthly which is a month after using the phone while PCS (Personal Communication Service) phone can be paid before using the phone. It is a prepaid phone.
The difference is that an i phone has touch screen. It also has a lot of aplications
Yes, dogs can see TV and phone screens, but their vision is different from humans. They can see moving images on screens, but they may not perceive details as clearly as humans do.
No
A treadmill is a machine for exercising, and a mobile phone is a portable phone.
The iPhone 4 is more advanced than the other iPhones. It is a more advanced phone with good quality which makes everything picture perfect. An iPhone 4 can take high resolution pictures, record with a higher resolution, and do everything a computer would do.
yes
nothing