Learn Finnish: Kuulen vain taustamelua, joten yritän soittaa sinulle uudelleen. - I only hear background noise, so I will try to call you again.

Joten means "so" or "therefore" and expresses a consequence. The first part of the sentence (hearing noise) is the cause, and the second part (trying to call again) is the result. Remember that in Finnish, you always put a comma before joten when it connects two full clauses.

Why is taustamelua (background noise) in the partitive case?

Two reasons combine here: background noise is an uncountable mass noun, and the action of hearing it is an ongoing, incomplete process rather than a finished action. Therefore, it takes the partitive ending -a.

Why do we say sinulle (to you) instead of putting "you" in an object case like sinut?

The verb soittaa literally means "to ring" or "to play an instrument". When you call someone on the phone, you are figuratively ringing "to" them, which is why it requires the allative case (-lle).

The English translation says "I will try", but yritän is in the present tense. How do we show it is happening in the future?

Finnish does not have a separate future tense. You just use the present tense (yritän) and rely on the context to show that the action will happen shortly after the current moment.