Apple has limited the use of the AirDrop wireless file sharing function on devices in China. Users of iPhones in mainland China can send or receive files from non-contacts for only up to 10 minutes. Users not in China face no such restriction and are able to receive files wirelessly from anyone. The change does not appear to affect iPhones in use in China that were purchased outside the country. Apple told CNN Business the new feature will be expanded globally in the coming year.