I heard my uncle saying that one must not touch the Quran if he isn’t in Wudu. Is this true? And if so does that mean i cannot read the Quran on my phone while I am not in Wudu?

Yes if you are not on wudhu you cannot touch the text of the Qur’an. You can carry it and touch the edges, but not the text.

This only applies to an actual book and not your phone. You can touch your screen if you are not on wudhu.