Actually u dont pre pay for a phone.
The gap between the literal meaning of a term and the general public perception of that term is an interesting area for discussion. (Although I don/t advocate the ext), ".ws" is one example. Domainers generally know that .ws literally stands for Western Samoa. But, take a quick poll among a group not associated w/ domain names, and the perception of the .ws meaning is almost universally "website".
When people speak of, or POP advertising displays, "Phone Card", the general perception is not that the card is selling phones or SIM, but that it's function is to provide "calling time", or "air time" to the user. Although the name is not technically accurate, it enters into the vernacuclar, and eventually, the definition is altered due to it's common usage.
OT-Why, than, not advocate .ws? In some instances, when the public, (which, at first, is behind the curve of the specialists), catches up, and can make the distintion (between actual and perceived), the earlier perceived meaning may be rejected (and/or replaced w/ an equal or better alternative). IMHO, when the public understands what .ws actually stands for, there will be an "indignancy" over having been "fooled" that will reflect negatively on the term and it will not be accepted in common usage.:gl: IMHO