Still, who among those present understands how calls and messages will be possible without the Internet?? 
Who told you that there will be no Internet?
The phones operating system has a modified Google Chrome browser.
It will work in two modes - regular and blockchain.
In blockchain mode, all information will be transmitted through the secure blockchain FXTP protocol.
Thus, all information will be stored and transmitted in the blockchain.
I hope you understand?
?? Source: https://medium.com/functionx/product-development-update-xphone-design-journey-64c6910fd4d1"When a user sends a text message or makes a call through BOB, that message or call will be transmitted through various actions executed on the blockchain, rather than through a centralized mobile carrier." Source:
https://medium.com/functionx/product-development-update-xphone-design-journey-64c6910fd4d1