Write the next sentence in the following story.

How to top up your phone
Find a store that sells top-up cards.
Most prepaid phones can be topped up using prepaid load cards. All you need to do is to find a retail store or convenience outlet that sells the top-up card specifically for the network service provider/carrier you're using.
Go up to the cashier and purchase a top-up card. Prices of these prepaid load cards are the same as the value they hold.