Sorry, it's hard to hear you.

すみません、声が遠いのですが。

Is it hard to hear me?

聞こえづらいですか？

Can you hear me?

聞こえますか？

I can hear you just fine.

よく聞こえます。

It was hard to hear you before.

But I can hear you well now.

It's hard to〜

〜しづらい