Hi guys im android fan but i just bought ip7+ due to discounted price yesterday....right now what is the best ios ver to settle.... i plan after updating to the best ios ver im gonna stop update the device forever....cuz last time when i update my ip5 to latest ios ver at that time my ip5 become sluggish and slow...so i dont want that to ahooen again with my 7+...my priority is battery life cuz....im gonna use this phone side by side with my trustee android device...