Upload the image of my own Iphone or Sumsung cellphone to a forum, Is this a behaviour of trademark infringement?

Upload the image of my own Iphone or Sumsung cellphone to a forum, Is this a behaviour of trademark infringement?

No
It is not "Trademark infringement" unless you are using the picture to do business… The benchmark is 'does your use of the phone picture cause other people to confuse your product and iPhone/Samsung's product

it is not even copyright infringement, since your picture of the iPhone/Samsung would be considered 'fair use'

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