4g smartphone phablet series apple iphone display size 55 inch display resolution 1920 x 1080 pixels display resolution full hd display type ips touchscreen multitouch force touch capacitive display characteristics retina anti fingerprint dual domain pixels pixel density 401 ppi brightness 625 cdm contrast 13001 ram 3 gb internal memory gb 128 gb processor manufacturer apple processor type a10 processor core 4 cpu clock speed 24 ghz