White labeling is when one company buys its product from another company and rebrands it as their own. The company which sells the final product to the consumer is usually not involved in the manufacturing process.
/wajt lejbl/ [uncountable] often used before another noun (business) a product that is made by one company but sold by another company using their own name. There's a market for white-label smartphones, as they offer a low-price option.