My former phone was HTC ONE M7, I loved the phone so much, in fact it gave me all I needed on a smartphone and more.

Until I started noticing some purple colour on photos I snapped in dark environment.

Chai! the thing pain me so tail, I no fit cry but I continued using the phone (since am not a camera fan) until a friend of mine ( An iPhone fan) opted for it ( The guy is still using the phone till date).

I sold it and went for HTC ONE M8 which am still using till date.

Am still using HTC ONE M8 because I don't have any reason to change it, the phone no wan gree spoil and any software way I try put dey enter.
I've already ported HTC 10 Rom on my M8 ( Android 6.0.1, Sense 8, HTC 10 camera etc ).

The software on my M8 is the same as the one on HTC latest flagship (HTC 10).

I was robbed of my tecno p6 in ado-ekiti

So i got a tecno W4

I started with Java phones Sagem my x5,Myx7,myx2-2,Motorola L6,L7,Nokia 3110c,5200,5300,5800,1600,E66,E65,N70,N71,E52,1100,3310 ,710,500,N82,N8 to mention but few Sony Ericsson k750,k770i,etc, Samsung Galaxy Grand prime 2.
To me best OS is Symbian S60v3 followed by Symbian Anna then Android OS.