Hello frinds, am using xiaomi mi4i .it is very smart android phone for smart people.it support all types of applications like facebook , whatsapp and many more applications which we love most.it is android 5.1 lollipop and it has 2gb ram.it is 441 ppi which means pixel per inch.its ppi is more than all phone.it has 1.7 gh quad core processor.which supports many applications at same times.it also supports heavy applications and 3d games also.it is most slimest phone and 65 grams in weight.there are two models in mi4i which have 16gb and 32gb memory.I gave a best suggestion to read full specifation of this phone on internet and compare it with another phones.thanks again wish you good luck.bye
