Spec Req for cellphones

Any thoughts on min/max specifications for a roughly decent quality cellphone by '16 standards?

How many cores should it have? Is 512 mb ram too little? How much ram is too much on a smartphone? Other spec req?

>>2
I mostly use web browser, ssh client, and text editor; and find that 1 GB still isn't enough for switching between apps without having them restart all the time.