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Zenfone 9 - swollen battery or tap reading system? Is the back of your phones perfectly flat?

Not applicable

I've been using my Zenphone for 3 months...  Now I can feel under my fingers and see in harsh direct light that the back of the phone is not perfectly flat. 

This small bulge has the size and shape of a battery and is located in the same area. 
But it's really slight 

Can it be normal? Did I just not notice it before?
Are there any Zenfone 9 owners who can check their phones?
Perhaps I am oversensitive? Maybe this tiny bulge is just a back tap reading system?




Star III

it's been like this from the beginning, i also notice it after 3 months , now its been over a year...