Verified answer

You can access FB mobile by going to m.facebook.com, but I don't know if that will affect your post. There is emulating software you can download that can probably emulate a phone and if it's set up to use your internet connection, might make it look like you're using a mobile phone. However, in order to use Facebook mobile on a phone, you have to set it up on Fb's website and select your carrier and number and stuff, so that might be necessary in order to make your post look like it came from a mobile device. If that's true, then there's nothing you can do.

you cant...