Phonewalled

Similar to paywalled, it indicates a website or service that requires you to register with your phone number.

I can't register at twitter, it's phonewalled.

Phonewalled by csehszlovakze October 20, 2019

Phonewall 

Ignoring a face-to-face conversation for anything on a cell phone.

I tried taking to her, but I got phonewalled.

Phonewall by kgcagey January 23, 2011

Phonewalker 

People who are forced to be in gym class so they go around the track on their phones.

Guy 1: No way is that a Phonewalker?
Guy 2: I think so, that sucks gym class is a requirement for them.

Phonewalker by Supercreeper1226 March 18, 2022