How many mobile phones can I carry duty-free when traveling abroad?

China's customs regulations: foreign countries bring back less than 5000 tax exemption, plus airport duty-free shops within 3000 tax exemption. These two quotas exceed either of them in terms of regulations, and the excess is subject to tax. When leaving the customs, every passenger needs to fill out a personal tax return. If the purchase is less than the above amount, the general airport customs will not look for you. If it is a big bag, it is obviously suspected of tax evasion. When you leave the airport, the customs officer will check your carry-on luggage.