The rule states that it is acceptable to omit the prefix. If you insist on using one, you should pronounce it as "slash," or similar variations like "/QRP" or "/M," without pronouncing the slash itself. However, many people are accustomed to saying "portable" (which actually refers to "/P" and using a portable device for transmission). It's unclear how this became equivalent to pronouncing the slash. In reality, some people may not recognize the word "slash." Therefore, I recommend being flexible and prioritizing pronunciation as "slash" or omitting it altogether. If the other party doesn't understand, you can then switch to saying "portable."
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