This is a picture of the iPhone 7's mic. Samsung cell phone mics are basically identical. To buy a replacement costs about $0.25. Notice the dimensions. The diaphragm is less than 2 millimeters wide.
When you record a demo of your multi-thousand dollar rig with one of these, with the cell phone mic facing down at the floor like is usually done because as we all know it's more important to record the "star" rocking out during the "amp demo" than it is to actually record the sound of the amp as featured in the proclaimed "amp demo," you're wasting everyone's time. Also, I'm sorry but no, it doesn't "sound like it does in the room and I'm doing you a favor and giving you the real life experience, bruh." It sounds like you're recording an amp with the worst $0.25 radioshack mic imaginable, that is actually pointing
away from the amp on top of that. Listening to an amp recorded like this sounds like you're listening to an amp that was recorded in some normal way but is now being played back through a cheap AM radio that has been placed in a tile bathroom, and you're 10 feet outside that bathroom.
Cell phone amp demos are not only useless, they actually detract from how any given setup sounds. They sound absolutely nothing like either what the rig sounds like mic'd, or what it sounds like "in the room." Cell phone mics as they're typically used to record amps (again, filming the "star" while the mic is pointed at the floor) make every amp sound identically like a boomy, woofy, fizzy mess.
If you do this, I'm talking specifically to you. Please stop. You are not only wasting your own time, but everyone else's. The clips you're posting are absolutely useless and sound nothing like the amp in any capacity, in any context. If you have the money to buy a guitar rig worth posting online about, you have the money to buy a used SM57 for like $50-60, which will make all the difference in the world.
Thank you. That is all.