In the following sentence:
The relevant part means:
Not only it is more spacious, lighter, and more comfortable, and faster, but the signal of the phone is also better. All of them are the changes you can sense.
Usually, the adjectives are concatenated with a conjunction, such as 和 or 并. But in this case the adjectives are not concatenated with any conjunction, and it is in the form of "ABC", not "A、B和C".
Why does it use no conjunction, and how can I know in which situations it is required to use a conjunction to concatenate adjectives.
Also, does the meaning get different if I add 和 in this case?