Breakdown of Я звоню по поводу вашей рекламы.
я
I
ваш
your [formal/plural]
звонить
to call
реклама
advertisement
Questions & Answers about Я звоню по поводу вашей рекламы.
The current lesson is about насчёт, but this sentence uses по поводу. Are they interchangeable?
Both mean "regarding" or "about" and both require the Genitive case. По поводу is slightly more formal and is standard for business or official situations, like calling about an ad. Насчёт is more common in everyday conversation. You could perfectly well say насчёт вашей рекламы here.
What is the literal meaning of по поводу?
The noun повод means "reason", "cause", or "occasion". Combined with the preposition по (which triggers the Dative case here, ending in -у), the phrase literally means "on the reason of" or "concerning the occasion of".
Why are we using вашей рекламы instead of ваша реклама?
The compound preposition по поводу (just like насчёт) always forces the following noun phrase into the Genitive case. The feminine noun реклама changes its ending to -ы (рекламы), and its modifier ваша changes to вашей.
How would I change this sentence to say "I am calling YOU regarding your advertisement"?
You would add the pronoun вам (the Dative case of вы). The verb звонить (to call by phone) always takes the Dative case for the recipient of the call. The sentence would become: Я звоню вам по поводу вашей рекламы.