Translation:When I was little I did not have a mobile phone.
I have the same question but shall not stay here to wait for an answer; at 65 my life-expectancy is not long enough. It is an infinite shame that a course which was full of interest and has clearly been the subject of much dedicated work by its compilers in the past should have been ruined by so many inconsistencies and self-contradictions such as this: a problem which, apparently, nobody is now willing to address.
If your first language isn't English, then it will be helpful for you to know that "mobile telephone" simply isn't a common expression. To be honest, "mobile phone" is far from common any more either, at least in my part of the U.S., but in my entire life I don't think I've heard "mobile telephone" used to reference the relevant device itself. If your first language is English and that's what you say, well, that's what the report button's there for :)