I'm pretty sure you could run an entire household on nothing but Samsung at this point.
Phone? Check. Watch? Check. TV? check. Washer? Dryer? Fridge? Dishwasher? All there. Laptop? Well, they at least used to make those, not sure if they still do.
Today, you can use an Amazon smart speaker to interface (via an Amazon-produced, Amazon-cloud-hosted voice-command interface) with the Amazon web store to buy an ebook published by Amazon, for you to read on an Amazon tablet, that you bought from the same Amazon web store, that was delivered by Amazon, from an Amazon fulfillment warehouse to your front door.
Why limit yourself to only electronics? You can study at Samsung university, go to the amusement park of Samsung, take the Samsung metro, work at Samsung factories while living in a Samsung apartment, if you get sick you could go to the Samsung medical centre.
Phone? Check. Watch? Check. TV? check. Washer? Dryer? Fridge? Dishwasher? All there. Laptop? Well, they at least used to make those, not sure if they still do.