Reddit... phone slow down accept after year ?....in USA one In new year on some smartphones WhatsApp good bye Save mobile battery... lithium ion battery

(Reddit)... phone slow down accept after year ?....in USA one phone company accept it when new version come old version become slow down this is because of  software update problem this is connected to battery due to that processor will not work properly when battery become older phone gets slower or some works faster but battery not help them. 

In new year on some smartphones WhatsApp good bye black berry operating system black berry 10 windows phone 8.0 for older android operating system 1 Feb 2020 no what's app 2.3.7  gimber bread android version last year window phone 7 android 2.1.22 iOS 6 not available.

Save mobile battery... lithium ion battery  do not kept mobile in sun donot charge mobile more time period due to mobile cover mobile get hot if you want to kept mobile switch off do not charge dis charge mobile completely 5percent battery remain and kept switch off kept mobile britness less , britness increase battery decrease , Bluetooth WiFi internet connection on battery decrease .