Circular, backed by Y Combinator, is a service that offers consumers in Singapore and Australia subscriptions to high-end electronics, like iPhones, Circular, backed by Y Combinator, is a service that offers consumers in Singapore and Australia subscriptions to high-end electronics, like iPhones, Samsung Galaxy, iPad Pros and MacBook Pros. Not only does it want help people get devices at lower prices, but also keep them in circulation for as long as possible and out of the landfill.