You have to make sure that the phone itself can see the card first. Check/Google the phone model to see how much of a card it will be able to accept. For example, I have a Samsung Galaxy S5 (quite old) which takes a 128 GB card as against the entry level Samsung Galaxy Prime will only take a 32 GB card. If it is supposed to take the card you have, you may have to the phone settings and check what options you have there.