Utilize the input text as a context reference, choose the right relationship between iPhone and Apple Inc from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Aug 31 Apple Inc on Monday teamed up with network gear maker Cisco Systems Inc to improve the performance of its iPad and iPhone devices on Cisco's corporate network.

Answer: manufacturer