You can contact a seller advertising an item with the number provided besides the advert or by sending them a direct message or chat
The seller will receive your message and will respond by calling or through the message they received.
Chat or send message increases your chances of closing the deal as all chats are delivered to seller. Its also a safer way of carrying out your transaction on OLX.
While browsing the site, you'll find a variety of products and services. Search through the ads, choose the item you want and contact the seller.
*Please note that after you make your mind to purchase the item, ensure to meet at a public location. Inspect the item thoroughly before and after you buy it and pay only after collecting the item.