You can't have a blockchain in your cellphone. That's a fact, a fact that will never change even if you get 1 KB blocks.
Except you can.
No matter the size of the blocks, you will need a properly configured server to run a full node. Most people in the world aren't capable or don't have access to the technology of running a server (as astonishing as it sounds)
The same is true of technical skill, most people in the world are hardly technically literate enough to run MS Word.