(1)Chipset; This help u operate ur phone fluently without hooking
(2)GPU; This help for operating high graphic Games with large capacity e.g 2GB data Games that can't operate on low end phone due to small graphic interface
(3)RAM;Is the most important for multitasking,low ram smart phone lag when install few application but u can install more than 500 applications on single phone with atleast 3GB Ram.Most of the world largest smartphone producers reached RAM capacity of 4GB to 6GB RAM but Gionee,Infinix and Tecno stick on 2GB Ram that is why we left behind using outdated specified phones at higher rate cost.
(4)Battery:Larger battery help u to rock on smartphone sru out d day without frequent plugin of charger or porting larger power bank from door to door.
(5)OS Version:Latest operating system help u install any application u see including latest release.if u are using older version u will come across of installing unsupported applications.
(1)Donut(2)Eclairs(3)Froyo(4)Gingerbread(5)Honeycomb(6)Icecreamsandwich(7)Jellybean(Kitkat, all are older version and newer are9)Lollipop(10)Mashmallow(11)Nougat These are Android OS Version.
(6)Screen Size;This range from smaller to larger inches e.g 4.7,4.8,5.0,5.1,5.2,5.3,5.5,5.7,6.0,7.0,8.0,9.0,10.1 from palmlet to tablet and the most important is pixel per unit which help for vivid colour and clearity of the screen.
Then shatter proof protection e.g coning gorilla,dragontrail,saphire glasses.
(7)Camera;Is one of the best alwayz trying to improve by some other mobile companies e.g Huawei who introduce double camera phone this year Huawei Mate P9 for u to snap selfie and covering beautiful video.
(Sensors;E.g Fingerprint and Iris scanners for security,Temperature Humidity Barometer Heartrate for Health and Giographical evaluation,NFC; for using smart cards buying and selling and data transfer,Infrared: for control of home appliance eg tv,Home theater,ac,dvd etc
Antenna support;for supporting sport bands,hand wears and antenna accessories
SpOS;For tracking sport activities.
Otherwise you will end changing phone monthly.

Nice one.

Nice one.

Which one is donut?